Cerebrospinal fluid leak: Difference between revisions

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A '''cerebrospinal fluid leak''' ('''CSF leak''' or '''CSFL''') is a medical condition where the [[cerebrospinal fluid]] (CSF) surrounding the [[brain]] or [[spinal cord]] leaks out of one or more holes or tears in the [[dura mater]].<ref>{{MedlinePlusEncyclopedia|001068|CSF leak}}</ref><ref>{{EMedicine|article|338989|Cerebrospinal Fluid Leak Imaging}}</ref> A cerebrospinal fluid leak can be either cranial or spinal, and these are two different disorders.<ref name="CSFLF">{{cite web |title=Are all CSF leaks similar? |url=https://spinalcsfleak.org/are-all-csf-leaks-similar/ |website=Spinal CSF Leak Foundation |date=29 April 2018}}</ref> A spinal CSF leak can be caused by one or more [[meninges|meningeal]] [[diverticulum|diverticula]] or CSF-venous [[fistula]]s not associated with an [[epidural space|epidural leak]].<ref name=":0">{{Cite journal|last1=Kranz|first1=Peter G.|last2=Luetmer|first2=Patrick H.|last3=Diehn|first3=Felix E.|last4=Amrhein|first4=Timothy J.|last5=Tanpitukpongse|first5=Teerath Peter|last6=Gray|first6=Linda|date=2015-12-23|title=Myelographic Techniques for the Detection of Spinal CSF Leaks in Spontaneous Intracranial Hypotension|journal=American Journal of Roentgenology|volume=206|issue=1|pages=8–19|doi=10.2214/AJR.15.14884|pmid=26700332|issn=0361-803X}}</ref><ref name=":1">{{Cite journal|last1=Kranz|first1=Peter G.|last2=Amrhein|first2=Timothy J.|last3=Gray|first3=Linda|date=December 2017|title=CSF Venous Fistulas in Spontaneous Intracranial Hypotension: Imaging Characteristics on Dynamic and CT Myelography|journal=AJR. American Journal of Roentgenology|volume=209|issue=6|pages=1360–1366|doi=10.2214/AJR.17.18351|issn=1546-3141|pmid=29023155}}</ref><ref name=":2" />
A '''cerebrospinal fluid leak''' ('''CSF leak''' or '''CSFL''') is a medical condition where the [[cerebrospinal fluid]] (CSF) surrounding the [[brain]] or [[spinal cord]] leaks out of one or more holes or tears in the [[dura mater]].<ref>{{MedlinePlusEncyclopedia|001068|CSF leak}}</ref><ref>{{EMedicine|article|338989|Cerebrospinal Fluid Leak Imaging}}</ref> A cerebrospinal fluid leak can be either cranial or spinal, and these are two different disorders.<ref name="CSFLF">{{cite web |title=Are all CSF leaks similar? |url=https://spinalcsfleak.org/are-all-csf-leaks-similar/ |website=Spinal CSF Leak Foundation |date=29 April 2018}}</ref> A spinal CSF leak can be caused by one or more [[meninges|meningeal]] [[diverticulum|diverticula]] or CSF-venous [[fistula]]s not associated with an [[epidural space|epidural leak]].<ref name=":0">{{Cite journal|last1=Kranz|first1=Peter G.|last2=Luetmer|first2=Patrick H.|last3=Diehn|first3=Felix E.|last4=Amrhein|first4=Timothy J.|last5=Tanpitukpongse|first5=Teerath Peter|last6=Gray|first6=Linda|date=2015-12-23|title=Myelographic Techniques for the Detection of Spinal CSF Leaks in Spontaneous Intracranial Hypotension|journal=American Journal of Roentgenology|volume=206|issue=1|pages=8–19|doi=10.2214/AJR.15.14884|pmid=26700332|issn=0361-803X}}</ref><ref name=":1">{{Cite journal|last1=Kranz|first1=Peter G.|last2=Amrhein|first2=Timothy J.|last3=Gray|first3=Linda|date=December 2017|title=CSF Venous Fistulas in Spontaneous Intracranial Hypotension: Imaging Characteristics on Dynamic and CT Myelography|journal=AJR. American Journal of Roentgenology|volume=209|issue=6|pages=1360–1366|doi=10.2214/AJR.17.18351|issn=1546-3141|pmid=29023155}}</ref><ref name=":2" />


CSF leaks are either caused by trauma including that arising from [[Iatrogenesis|medical interventions]], or have [[idiopathic|no known cause]] known as [[spontaneous cerebrospinal fluid leak]]s (sCSF leaks). Traumatic causes include a [[lumbar puncture]] noted by a [[post-dural-puncture headache]], and other [[physical trauma|trauma]] such as from a fall or accident. Spontaneous CSF leaks are associated with heritable [[connective tissue disorder]]s including [[Marfan syndrome]] and [[Ehlers–Danlos syndromes]].<ref>{{cite journal |last1=Reinstein |first1=E |last2=Pariani |first2=M |last3=Bannykh |first3=S |last4=Rimoin |first4=D |last5=Schievink |first5=WI |title=Connective tissue spectrum abnormalities associated with spontaneous cerebrospinal fluid leaks: a prospective study. |journal=European Journal of Human Genetics |volume=21 |date=April 2013 |issue=4 |pages=386–390 |doi=10.1038/ejhg.2012.191 |pmid=22929030|pmc=3598315 }}</ref>
CSF leaks are either caused by trauma including that arising from [[Iatrogenesis|medical interventions]], or occur spontaneous ('''spontaneous cerebrospinal fluid leaks'''; sCSF leaks), sometimes in those with predisposing conditions. Traumatic causes include a [[lumbar puncture]] noted by a [[post-dural-puncture headache]], and other [[physical trauma|trauma]] such as from a fall or accident. Spontaneous CSF leaks are associated with heritable [[connective tissue disorder]]s including [[Marfan syndrome]] and [[Ehlers–Danlos syndromes]].<ref>{{cite journal |last1=Reinstein |first1=E |last2=Pariani |first2=M |last3=Bannykh |first3=S |last4=Rimoin |first4=D |last5=Schievink |first5=WI |title=Connective tissue spectrum abnormalities associated with spontaneous cerebrospinal fluid leaks: a prospective study. |journal=European Journal of Human Genetics |volume=21 |date=April 2013 |issue=4 |pages=386–390 |doi=10.1038/ejhg.2012.191 |pmid=22929030|pmc=3598315 }}</ref>

A loss of CSF greater than its rate of production leads to a decreased volume inside the skull known as [[Intracranial pressure#Low ICP|intracranial hypotension]].

Any CSF leak is most often characterized by [[orthostatic headache]]s, which worsen when standing, and improve when lying down. Other symptoms can include neck pain or stiffness, nausea, vomiting, dizziness, fatigue, and a metallic taste in the mouth. A [[CT scan]] can identify the site of a cerebrospinal fluid leakage. Once identified, the leak can often be repaired by an [[epidural blood patch]], an injection of the patient's own blood at the site of the leak, a [[fibrin glue]] injection, or surgery.

The set of symptoms associated with a sCSF leak is referred to as a ''spontaneous cerebrospinal fluid leak syndrome'' (SCSFLS). A sCSF leak is uncommon but not rare, affecting at least one in 20,000 people and many more who go undiagnosed every year. On average, the condition develops at age 42, and women are twice as likely to be affected. Some people with a sCSF leak have a chronic leak of cerebrospinal fluid despite repeated patching attempts, leading to long-term disability due to pain and being unable to be upright, and surgery is often needed. SCSFLS was first described by German [[neurologist]] [[Georg Schaltenbrand]] in 1938 and by American neurologist [[Henry Woltman]] of the [[Mayo Clinic]] in the 1950s.

==Classification==
Spontaneous cerebrospinal fluid leaks are classified into two main types: [[Human cranium|cranial]] leaks,<ref name="Lloyd">{{Cite journal | journal = Radiology | first3 = P. A. | volume = 248 | pages = 725–36 | issue = 3| pmid = 18710972 | last3 = Hudgins | first2 = J. M. | year = 2008 | title = Imaging of Skull Base Cerebrospinal Fluid Leaks in Adults | last1 = Lloyd | first1 = K. M. | last2 = Delgaudio | doi = 10.1148/radiol.2483070362 }}</ref> and [[spinal canal|spinal]] leaks.<ref name="Gordon">{{Cite journal | doi = 10.1111/j.1469-8749.2009.03514.x | pmid = 19909307 | title = Spontaneous intracranial hypotension | year = 2009 | last1 = Gordon | first1 = N. | journal = Developmental Medicine & Child Neurology | volume = 51 | issue = 12 | pages = 932–935 | s2cid = 39157001 | url = https://www.pediatricneurologybriefs.com/jms/article/view/pedneurbriefs-27-10-5 | doi-access = free }}</ref> The vast majority of leaks are spinal.<ref name="mokri2013">{{cite journal | author = Mokri, B. | year = 2013 | title = Spontaneous low pressure, low CSF volume headaches: spontaneous CSF leaks | journal = Headache: The Journal of Head and Face Pain | volume = 53 | issue = 7 | pages = 1034–1053 | doi = 10.1111/head.12149 | pmid = 23808630 | s2cid = 44300449 | doi-access = free }}</ref> Cranial leaks occur in the head, and in some of these cases, CSF can leak from the nose, or from the ear.<ref name="Tam">{{cite journal |last1=Tam |first1=EK |last2=Gilbert |first2=AL |title=Spontaneous cerebrospinal fluid leak and idiopathic intracranial hypertension. |journal=Current Opinion in Ophthalmology |date=November 2019 |volume=30 |issue=6 |pages=467–471 |doi=10.1097/ICU.0000000000000603 |pmid=31449087}}</ref> Spinal leaks occur when one or more holes form in the dura along the spinal cord.<ref name="Gordon" /> Both cranial and spinal spontaneous CSF leaks cause neurological symptoms as well as [[spontaneous intracranial hypotension]] (SIH), diminished volume, and [[intracranial pressure|pressure of the cranium]].<ref name="Maher">{{Cite journal | pmid = 16859268 | year = 2000 | last1 = Maher | first1 = CO | last2 = Meyer | last3 = Mokri | title = Surgical treatment of spontaneous spinal cerebrospinal fluid leaks | volume = 9 | issue = 1 | pages = e7 | journal = Neurosurgical Focus | doi = 10.3171/foc.2000.9.1.7 | doi-access = free }}</ref> While this symptom can be referred to as ''intracranial hypotension'', the intracranial pressure may be normal, with the underlying issue instead being low CSF volume. For this reason, a SCSFL is referred to as ''CSF hypovolemia'' as opposed to ''CSF hypotension''.<ref name="Greenberg">{{cite book |title=Handbook of neurosurgery |last=Greenberg |first=Mark |year=2006 |publisher=Thieme Medical Publishers |location=New York, NY |isbn=978-0-86577-909-9 |page=178 |url=https://books.google.com/books?id=ExHcxxufG8sC&q=Spontaneous+intracranial+hypotension&pg=PA178 |access-date=18 December 2009}}</ref><ref name="MillerHoyt2005">{{cite book|author1=Neil R. Miller|author2=William Fletcher Hoyt|title=Walsh and Hoyt's clinical neuro-ophthalmology|url=https://books.google.com/books?id=ATTlVWi3mvwC&pg=PA1303|access-date=8 November 2010|year=2005|publisher=Lippincott Williams & Wilkins|isbn=978-0-7817-4811-7|pages=1303–}}</ref><ref name="Mokri Mayo">{{Cite journal | issue = 11 | pages = 1113–1123 | journal = Mayo Clinic Proceedings | doi = 10.4065/74.11.1113 | volume = 74 | title = Spontaneous cerebrospinal fluid leaks: from intracranial hypotension to cerebrospinal fluid hypovolemia--evolution of a concept | year = 1999 | pmid = 10560599 | last1 = Mokri | first1 = B.}}</ref><ref name="Schievink2000">{{Cite journal| pmid = 16859269| year = 2000| last1 = Schievink| first1 = WI| title = Spontaneous spinal cerebrospinal fluid leaks: a review| volume = 9| issue = 1| pages = 1–9| journal = Neurosurgical Focus| doi = 10.3171/foc.2000.9.1.8| doi-access = free}}</ref>

The diagnostic criteria for SCSFLS is based on the 2004 International Classification of Headache Disorders, 2nd edn (ICHD-II) (Table 1) (50) criteria. However, the presentation of patients with confirmed diagnosis may be very different from that of the clinical diagnostic criteria and cannot be considered authoritative.<ref name="Schievink2008"/>


==Signs and symptoms==
==Signs and symptoms==
{| class="wikitable" style = "float:right; margin-left:15px; text-align:center"
The most common symptom of a CSF leak is a fast-onset, extremely painful [[orthostatic headache]] or [[thunderclap headache]].<ref>{{Cite news|url=https://www.mayoclinic.org/diseases-conditions/thunderclap-headaches/symptoms-causes/syc-20378361|title=Thunderclap headaches - Symptoms and causes|work=Mayo Clinic|access-date=2018-08-01|language=en}}</ref>
|+ ''' Symptoms resulting from nerve impact'''<ref name="Schievink2008">{{Cite journal| issue = 12| pages = 1345–1356| year = 2008| doi = 10.1111/j.1468-2982.2008.01776.x| volume = 28| title = Spontaneous spinal cerebrospinal fluid leaks| journal = Cephalalgia: An International Journal of Headache| pmid = 19037970| last1 = Schievink| first1 = W. I. | s2cid = 40813766}}</ref>
! Nerve !! Function !! Symptoms
|-
| [[optic nerve|optic]]<br /> (2) || optic nerve<br /> crossing || blurred and or<br />double vision
|-
| [[chorda tympani]]<br /> (Branch of 7) || taste || [[dysgeusia|taste distortion]]
|-
| [[facial nerve|facial]]<br /> (7) || facial nerve || facial weakness<br /> and numbness
|-
|[[vestibulocochlear nerve|vestibulocochlear]]<br /> (8) || hearing, <br />balance || hearing and<br /> balance problems
|-
| [[glossopharyngeal nerve|glossopharyngeal]]<br /> (9) || taste || taste distortion
|}

The most common symptom of a CSF leak is a fast-onset, extremely painful [[orthostatic headache]] or [[thunderclap headache]].<ref>{{Cite news|url=https://www.mayoclinic.org/diseases-conditions/thunderclap-headaches/symptoms-causes/syc-20378361|title=Thunderclap headaches - Symptoms and causes|work=Mayo Clinic|access-date=2018-08-01|language=en}}</ref><ref name="Schievink2000"/><ref name="Vaidhyanath">{{Cite journal | doi = 10.1136/emj.2007.048694 | title = Spontaneous intracranial hypotension: a cause of severe acute headache | year = 2007 | last1 = Vaidhyanath | first1 = R. | last2 = Kenningham | first2 = R. | pmc = 2658456 | last3 = Khan | first3 = A. | last4 = Messios | first4 = N. | journal = Emergency Medicine Journal | volume = 24 | pages = 739–741| pmid = 17901290 | issue = 10 }}</ref> This headache is usually made worse by [[standing]] and typically becomes prominent throughout the day, with the pain becoming less severe when lying down.<ref name="Schievink2009">{{Cite journal| issue = 3| volume = 110| journal = Journal of Neurosurgery| pages = 521–524| year = 2009| doi = 10.3171/2008.9.JNS08670| pmid = 19012477| title = Spontaneous spinal cerebrospinal fluid leak as a cause of coma after craniotomy for clipping of an unruptured intracranial aneurysm | first4 = G.| last2 = Palestrant | first1 = W. | first2 = D.| last3 = Maya| last4 = Rappard | first3 = M.| last1 = Schievink }}</ref> [[Standing|Orthostatic]] headaches can become chronic and disabling to the point of incapacitation.<ref name="Schievink2000"/><ref name="Mehta"/><ref name="Mea">{{Cite journal | doi = 10.1007/s10072-009-0060-8 | title = Clinical features and outcomes in spontaneous intracranial hypotension: a survey of 90 consecutive patients | pmid = 19415418 | year = 2009 | last1 = Mea | first1 = E. | last2 = Chiapparini | first2 = L. | last3 = Savoiardo | first3 = M. | last4 = Franzini | first4 = A. | last5 = Bussone | first5 = G. | last6 = Leone | first6 = M. | journal = Neurological Sciences | volume = 30 | issue = S1 | pages = S11–S13 | s2cid = 33678574 }}</ref><ref name="VictorsandAdams2005">{{cite book |author1=Victor, Maurice |author2=Ropper, Allan H. |author3=Adams, Raymond Delacy |author4=Brown, Robert F. |title=Adams and Victor's principles of neurology |url=https://archive.org/details/adamsvictorsprin00ropp_284 |url-access=limited |publisher=McGraw-Hill Medical Pub. Division |location=New York |year=2005 |pages=[https://archive.org/details/adamsvictorsprin00ropp_284/page/n552 541]–543 |isbn=978-0-07-141620-7 }}</ref> Some patients with a SCSFL will develop headaches that begin in the afternoon. This is known as ''second-half-of-the-day headache''. This may be an initial presentation of a spontaneous CSF leak or appear after treatment such as an epidural patch, and likely indicates a slow CSF leak.<ref name="Hunderfund2011">{{Cite journal | last1 = Leep Hunderfund | first1 = A. N. | last2 = Mokri | first2 = B. | title = Second-half-of-the-day headache as a ''manifestation of'' spontaneous CSF leak | doi = 10.1007/s00415-011-6181-z | journal = Journal of Neurology | year = 2011 | pmid = 21811806 | volume=259 | issue=2 | pages=306–10| s2cid = 43308694 }}</ref>


A spinal leak may cause [[intracranial pressure#Low ICP|spontaneous intracranial hypotension]] (low CSF pressure) because the body cannot replenish the [[Cerebrospinal fluid|CSF]] fast enough to keep pace with the leak. As a result, the brain may sag inside the skull and into the [[foramen magnum]], which is visible (and measurable) with an [[MRI]] of the brain. A cranial leak is more likely to cause [[intracranial hypertension]] (high CSF pressure), which carries a risk of [[meningitis]]. Both a cranial and spinal leak can fluctuate between high and low CSF pressure.{{citation needed|date=December 2020}}
A spinal leak may cause [[intracranial pressure#Low ICP|spontaneous intracranial hypotension]] (low CSF pressure) because the body cannot replenish the [[Cerebrospinal fluid|CSF]] fast enough to keep pace with the leak. As a result, the brain may sag inside the skull and into the [[foramen magnum]], which is visible (and measurable) with an [[MRI]] of the brain. A cranial leak is more likely to cause [[intracranial hypertension]] (high CSF pressure), which carries a risk of [[meningitis]]. Both a cranial and spinal leak can fluctuate between high and low CSF pressure.{{citation needed|date=December 2020}}
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While high CSF pressure can make lying down unbearable, low CSF pressure due to a leak can be relieved by [[supine position|lying flat on the back]].<ref name=":3">{{Cite web|url=https://www.cedars-sinai.edu/Patients/Programs-and-Services/Neurosurgery/Centers-and-Programs/Cerebrospinal-Fluid-Leak/CSF-Leak-A-Curable-Cause-of-Headache.aspx|title=CSF Leak: A Curable Cause of Headache|website=www.cedars-sinai.edu|language=en|access-date=2018-08-01}}</ref>
While high CSF pressure can make lying down unbearable, low CSF pressure due to a leak can be relieved by [[supine position|lying flat on the back]].<ref name=":3">{{Cite web|url=https://www.cedars-sinai.edu/Patients/Programs-and-Services/Neurosurgery/Centers-and-Programs/Cerebrospinal-Fluid-Leak/CSF-Leak-A-Curable-Cause-of-Headache.aspx|title=CSF Leak: A Curable Cause of Headache|website=www.cedars-sinai.edu|language=en|access-date=2018-08-01}}</ref>


About 50% of people with a CSFL experience [[neck pain]] or stiffness, [[nausea]], and [[vomiting]].<ref name="spears2014">{{cite journal | author = Spears, R. C. | year = 2014 | title = Low-pressure/spinal fluid leak headache | journal = Current Pain and Headache Reports | volume = 18 | issue = 6 | pages = 1–6 | doi = 10.1007/s11916-014-0425-4| pmid = 24760494 | s2cid = 22162918 }}</ref>
Other symptoms of a CSF leak can include [[neck pain]], [[photophobia]], [[dizziness]], [[gait]] disturbances, [[tinnitus]], [[visual]] disturbances, [[brain fog]], [[nausea]], fluid dripping from the nose or ears, and a metallic taste in the mouth. An untreated CSF leak can result in [[coma]] or death.<ref>{{Cite web|url=https://www.researchgate.net/publication/266253177|title=Headache Secondary to Intracranial Hypotension, Schievink, W and Deline, C|website=www.researchgate.net|language=en|access-date=2018-09-22}}</ref>

Other symptoms of a CSF leak include [[photophobia]], [[dizziness]] and [[vertigo (medical)|vertigo]], [[gait]] disturbances, [[tinnitus]], facial numbness or weakness, [[visual]] disturbances, [[brain fog]], [[neuralgia]], fatigue, fluid dripping from the nose or ears,<ref name="Hoffman2009"/><ref name="Schievink2000"/>


Movement disorders are uncommon in spontaneous CSF leaks but occasionally can be one of the major components of the clinical presentation.<ref>{{Cite journal|last=Mokri|first=Bahram|s2cid=3100453|date=December 2014|title=Movement disorders associated with spontaneous CSF leaks: a case series|journal=Cephalalgia: An International Journal of Headache|volume=34|issue=14|pages=1134–1141|doi=10.1177/0333102414531154|issn=1468-2982|pmid=24728303}}</ref>
Movement disorders are uncommon in spontaneous CSF leaks but occasionally can be one of the major components of the clinical presentation.<ref>{{Cite journal|last=Mokri|first=Bahram|s2cid=3100453|date=December 2014|title=Movement disorders associated with spontaneous CSF leaks: a case series|journal=Cephalalgia: An International Journal of Headache|volume=34|issue=14|pages=1134–1141|doi=10.1177/0333102414531154|issn=1468-2982|pmid=24728303}}</ref>

An untreated CSF leak can result in [[coma]] or death.<ref>{{Cite web|url=https://www.researchgate.net/publication/266253177|title=Headache Secondary to Intracranial Hypotension, Schievink, W and Deline, C|website=www.researchgate.net|language=en|access-date=2018-09-22}}</ref>


==Causes==
==Causes==
A spontaneous CSF leak is termed so as it has previously been thought to be [[idiopathic]], meaning the cause is unknown.<ref name="VictorsandAdams2005"/><ref name="SchievinkLouy2007">{{Cite journal | last1 = Schievink | first1 = W. I. | last2 = Louy | first2 = C. | title = Precipitating Factors of Spontaneous Spinal Csf Leaks and Intracranial Hypotension | journal = Neurology | volume = 69 | issue = 7 | pages = 700–702 | year = 2007 | doi = 10.1212/01.wnl.0000267324.68013.8e | pmid=17698794| s2cid = 43132714 }}</ref> The evidence of the last decade suggests however, that these leaks result from either a discogenic pathology, such as microspur, osteophyte or intra-dural disc herniation that pierces the dura like a knife, connective tissue disorder (which can often lead to discogenic pathology), or spinal drainage problems.<ref name="Beck 2019">{{Cite journal |last1=Beck |first=Jürgen |display-authors=etal |title = Diagnostic challenges and therapeutic possibilities in spontaneous intracranial hypotension |journal=Clinical and Translational Neuroscience |volume=2 |issue=2 |year=2018 |pages=2514183X1878737 |doi=10.1177/2514183X18787371 |doi-access=free}}</ref><ref name="Feichter 2019">{{Cite journal |last1=Feichter I. |title=Intradural non-calcified thoracic disc herniation causing spontaneous intracranial hypotension: a case report |journal=BMC Surg. |volume=19 |issue = 66 |year=2019 |page=66 |doi=10.1186/s12893-019-0527-3 |pmid=31226967 |pmc=6588915 |doi-access=free}}</ref>

A cerebrospinal fluid leak can be a rare complication of an [[anterior cervical discectomy and fusion]] (ACDF). One study suggested a CSF leak to follow from 0.5% of operations.<ref name="Yee">{{cite journal |last1=Yee |first1=TJ |last2=Swong |first2=K |last3=Park |first3=P |title=Complications of anterior cervical spine surgery: a systematic review of the literature. |journal=Journal of Spine Surgery |date=March 2020 |volume=6 |issue=1 |pages=302–322 |doi=10.21037/jss.2020.01.14 |pmid=32309668|pmc=7154369 |doi-access=free }}</ref> Another study suggests a CSF leak to follow from 1% of operations. In most of these cases repair is successful.<ref name="Syre">{{cite journal |last1=Syre |first1=P |last2=Bohman |first2=LE |last3=Baltuch |first3=G |last4=Le Roux |first4=P |last5=Welch |first5=WC |title=Cerebrospinal fluid leaks and their management after anterior cervical discectomy and fusion: a report of 13 cases and a review of the literature. |journal=Spine |date=15 July 2014 |volume=39 |issue=16 |pages=E936-43 |doi=10.1097/BRS.0000000000000404 |pmid=25010015}}</ref>
A cerebrospinal fluid leak can be a rare complication of an [[anterior cervical discectomy and fusion]] (ACDF). One study suggested a CSF leak to follow from 0.5% of operations.<ref name="Yee">{{cite journal |last1=Yee |first1=TJ |last2=Swong |first2=K |last3=Park |first3=P |title=Complications of anterior cervical spine surgery: a systematic review of the literature. |journal=Journal of Spine Surgery |date=March 2020 |volume=6 |issue=1 |pages=302–322 |doi=10.21037/jss.2020.01.14 |pmid=32309668|pmc=7154369 |doi-access=free }}</ref> Another study suggests a CSF leak to follow from 1% of operations. In most of these cases repair is successful.<ref name="Syre">{{cite journal |last1=Syre |first1=P |last2=Bohman |first2=LE |last3=Baltuch |first3=G |last4=Le Roux |first4=P |last5=Welch |first5=WC |title=Cerebrospinal fluid leaks and their management after anterior cervical discectomy and fusion: a report of 13 cases and a review of the literature. |journal=Spine |date=15 July 2014 |volume=39 |issue=16 |pages=E936-43 |doi=10.1097/BRS.0000000000000404 |pmid=25010015}}</ref>

===Discogenic causes===
The most common cause of an intractable "sCSF" leak is discogenic, either from an intra-dural disc herniation, osteophyte or microspur on the disc or vertebral body. "Recent radiological and microsurgical investigations revealed that a calcified, degenerative bony microspur is often the culprit lesion in cases of intractable CSF leaks. Arising from the level of the intervertebrate disk space, these microspurs pierce the ventral dura and produce a slit-like defect a few millimeters in length. These microspurs and the associated CSF leak have to be localized exactly, and then they are amenable to surgical treatment."<ref name="Beck 2019"/><ref name="Feichter 2019"/>

===Connective tissue theory===
Various scientists and physicians have suggested that SCSFLs may be the result of an underlying [[connective tissue disorder]] affecting the spinal dura.<ref name="Schievink2000"/><ref name="Schievink2008"/><ref name="Schievink2006"/><ref name="Liu2011">{{Cite journal | last1 = Liu | first1 = F. -C. | last2 = Fuh | first2 = J. -L. | last3 = Wang | first3 = Y. -F. | last4 = Wang | first4 = S. -J. | title = Connective tissue disorders in ''patients with'' spontaneous intracranial hypotension | doi = 10.1177/0333102410394676 | journal = Cephalalgia | volume = 31 | issue = 6 | pages = 691–695 | year = 2011 | pmid = 21220378 | s2cid = 21554078 }}</ref> It may also run in families and be associated with aortic aneurysms and joint hypermobility.<ref name="Schievink2008"/><ref name="Mokri2008">{{Cite journal | last1 = Mokri | first1 = B. | title = Familial Occurrence of Spontaneous Spinal CSF Leaks: Underlying Connective Tissue Disorder (CME) | journal = Headache: The Journal of Head and Face Pain | volume = 48 | issue = 1 | pages = 146–149 | year = 2007 | doi = 10.1111/j.1526-4610.2007.00979.x | pmid=18184297| s2cid = 32994607 }}</ref>

Up to two thirds of those affected demonstrate some type of generalized connective tissue disorder.<ref name="Schievink2008"/><ref name="Liu2011"/> [[Marfan syndrome]], [[Ehlers–Danlos syndrome]], and [[autosomal dominant polycystic kidney disease]] are the three most common connective tissue disorders associated with SCSFLs.<ref name="Schievink2008"/> Roughly 20% of patients with a SCSFL exhibit features of Marfan syndrome, including tall stature, hollowed chest ([[pectus excavatum]]), [[Hypermobility (joints)|joint hypermobility]] and [[Marfan syndrome#Skeletal system|arched palate]]. However, no other Marfan syndrome presentations are shown.<ref name="Schievink2008"/>

===Spinal drainage theory===
Some studies have proposed that issues with the spinal venous drainage system may cause a CSF leak.<ref name="Franzini">{{Cite journal| last1 = Franzini | first1 = A.| last2 = Messina | first2 = G.| last3 = Nazzi | first3 = V.| last4 = Mea | first4 = E.| last5 = Leone | first5 = M.| last6 = Chiapparini | first6 = L.| last7 = Broggi | first7 = G.| last8 = Bussone | first8 = G.| s2cid = 207609670| title = Spontaneous intracranial hypotension syndrome: a novel speculative physiopathological hypothesis and a novel patch method in a series of 28 consecutive patients| journal = Journal of Neurosurgery| volume = 112| issue = 2| pages = 300–6| year = 2009| pmid = 19591547| doi = 10.3171/2009.6.JNS09415 }}</ref> According to this theory, dural holes and intracranial hypotension are symptoms caused by low venous pressure in the epidural space. When inferior limb muscles pump blood towards the heart and pressure in the [[inferior vena cava]] vein becomes negative, the network of epidural veins is overdrained, causing CSF to be aspirated into the epidural space. True leaks can form at weak points in the spinal meninges. Therefore, the observed CSF hypotension is a result of CSF hypovolemia and reduced epidural venous pressure.<ref name="Franzini"/>

===Other causes===
Cranial CSF leaks result from intracranial hypertension in a vast majority of cases. The increased pressure causes a rupture of the cranial dura mater, leading to CSF leak and intracranial hypotension.<ref name="WoodworthPalmer2009"/><ref name="Schlosser2003">{{Cite journal | last1 = Schlosser | first1 = RJ | last2 = Wilensky | first2 = EM | last3 = Grady | first3 = MS | last4 = Bolger | first4 = WE | title = Elevated intracranial pressures in spontaneous cerebrospinal fluid leaks | journal = American Journal of Rhinology | volume = 17 | issue = 4 | pages = 191–5 | year = 2003 | pmid = 12962187| doi = 10.1177/194589240301700403 | s2cid = 39030096 }}</ref> Patients with a ''nude nerve root'', where the root sleeve is absent, are at increased risk for developing recurrent CSF leaks.<ref name="SchievinkJacques2003">{{Cite journal | last1 = Schievink | first1 = WI | last2 = Jacques | first2 = L | title = Recurrent spontaneous spinal cerebrospinal fluid leak associated with "nude nerve root" syndrome: case report | journal = Neurosurgery | volume = 53 | issue = 5 | pages = 1216–8; discussion 1218–9 | year = 2003 | pmid = 14580290| doi=10.1227/01.NEU.0000089483.30857.11| s2cid = 10793428 }}</ref> Lumbar disc herniation has been reported to cause CSF leaks in at least one case.<ref name="Kim2010">{{Cite journal | last1 = Kim | first1 = K. T. | last2 = Kim | first2 = Y. B. | title = Spontaneous Intracranial Hypotension Secondary to Lumbar Disc Herniation | journal = [[Journal of Korean Neurosurgical Society]] | volume = 47 | issue = 1 | pages = 48–50 | year = 2010 | pmid = 20157378 | pmc = 2817515 | doi = 10.3340/jkns.2010.47.1.48}}</ref> Degenerative spinal disc diseases cause a disc to pierce the dura mater, leading to a CSF leak.<ref name="Schievink2008"/>

==Complications==
[[File:MRI of human brain with type-1 Arnold-Chiari malformation and herniated cerebellum.jpg|thumb|[[Arnold–Chiari malformation]] is a condition where the cerebellar tonsils have descended, and should be considered in differential diagnosis of SCSFLS]]
Several complications can occur as a result of SCSFLS including decreased cranial pressure, brain herniation, infection, blood pressure problems, transient paralysis, and coma. The primary and most serious complication of SCSFLS is [[intracranial pressure#Low ICP|spontaneous intracranial hypotension]], where pressure in the brain is severely decreased.<ref name="Schievink2000"/><ref name="Schievink2006"/><ref name="Mokri2001">{{Cite journal | pmid = 11309218 | year = 2001 | last1 = Mokri | first1 = B | title = Spontaneous intracranial hypotension | volume = 5 | issue = 3 | pages = 284–91 | journal = Current Pain and Headache Reports | doi = 10.1007/s11916-001-0045-7| s2cid = 30963142 }}</ref> This complication leads to the hallmark symptom of severe [[orthostatic headache]]s.<ref name="Schievink2008"/><ref name="Mokri2001"/>

People with cranial CSF leaks, the rarer form, have a 10% risk of developing meningitis per year.<ref name="Abuabara"/> If cranial leaks last more than seven days, the chances of developing meningitis are significantly higher.<ref name="Abuabara"/> Spinal CSF leaks cannot result in meningitis due to the sterile conditions of the leak site.<ref name="Schievink2008"/> When a CSF leak occurs at the [[temporal bone]], surgery becomes necessary in order to prevent infection and repair the leak.<ref name="Stenzel">{{Cite journal| last1 = Stenzel | first1 = M.| last2 = Preuss | first2 = S.| last3 = Orloff | first3 = L.| last4 = Jecker | first4 = P.| last5 = Mann | first5 = W.| title = Cerebrospinal Fluid Leaks of Temporal Bone Origin: Etiology and Management| journal = ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties| volume = 67| issue = 1| pages = 51–5| year = 2005| pmid = 15753623| doi = 10.1159/000084306| s2cid = 24434779}}</ref> [[Orthostatic hypotension]] is another complication that occurs due to [[autonomic dysfunction]] when blood pressure drops significantly.<ref name="Schwedt2007"/> The autonomic dysfunction is caused by compression of the [[brainstem]], which controls breathing and circulation.<ref name="Schwedt2007"/>

Low CSF volume can cause the cerebellar tonsil position to descend, which can be mistaken for [[Chiari malformation]]; however when the CSF leak is repaired the tonsil position often returns to normal (as seen in upright MRI) in this "pseudo-Chiari" condition.<ref name="medscape.com"/>
A further, albeit rare, complication of CSF leak is transient [[quadriplegia]] due to a sudden and significant loss of CSF. This loss results in [[brain herniation|hindbrain herniation]] and causes major compression of the upper cervical spinal cord. The quadriplegia dissipates once the patient lies [[supine position|supine]].<ref name="SchievinkMaya2006">{{Cite journal | doi = 10.1212/01.wnl.0000218210.83855.40 | title = Quadriplegia and cerebellar hemorrhage in spontaneous intracranial hypotension | year = 2006 | last1 = Schievink | first1 = W. I. | journal = Neurology | volume = 66 | pages = 1777–8 | last2 = Maya | first2 = M. M.| pmid = 16769965 | issue = 11 | s2cid = 42704428 }}</ref> An extremely rare complication of SCSFLS is [[Oculomotor nerve palsy|third nerve palsy]], where the ability to move one's eyes becomes difficult and interrupted due to compression of the third cranial nerve.<ref name="Cánovas">{{Cite journal | pmid = 18726726 | year = 2008 | last1 = Alonso Cánovas | first1 = A | last2 = Martínez San Millán | first2 = J | last3 = Novillo López | first3 = ME | last4 = Masjuán Vallejo | first4 = J | title = Third cranial nerve palsy due to intracranial hypotension syndrome | volume = 23 | issue = 7 | pages = 462–5 | journal = Neurologia (Barcelona, Spain)}}</ref>

There are documented cases of reversible [[frontotemporal dementia]] and [[coma]].<ref name=Sayaoetal2009>{{Cite journal | pmid = 19378725 | year = 2009 | last1 = Sayao | first1 = AL | last2 = Heran | last3 = Chapman | last4 = Redekop | last5 = Foti | title = Intracranial hypotension causing reversible frontotemporal dementia and coma | volume = 36 | issue = 2 | pages = 252–6 | journal = The Canadian Journal of Neurological Sciences | first2 = MK | first3 = K | first4 = G | first5 = D | doi=10.1017/s0317167100006636| doi-access = free }}</ref> Coma due to a CSF leak has been successfully treated by using blood patches and/or fibrin glue and placing the person in the [[Trendelenburg position]].<ref name="Ferrente2009">{{Cite journal | doi = 10.1016/j.clineuro.2009.06.001 | title = Coma resulting from spontaneous intracranial hypotension treated with the epidural blood patch in the Trendelenburg position pre-medicated with acetazolamide | year = 2009 | last1 = Ferrante | first1 = E. | last2 = Arpino | first2 = I. | last3 = Citterio | first3 = A. | last4 = Savino | first4 = A. | journal = Clinical Neurology and Neurosurgery | volume = 111 | pages = 699–702| pmid = 19577356 | issue = 8 | s2cid = 2457796 }}</ref> [[Empty sella syndrome]], a bony structure that surround the pituitary gland, occurs in CSF leak patients.<ref name="WoodworthPalmer2009">{{Cite journal| last1 = Woodworth | first1 = B. A.| last2 = Palmer | first2 = J. N.| title = Spontaneous cerebrospinal fluid leaks| journal = Current Opinion in Otolaryngology & Head and Neck Surgery| volume = 17| issue = 1| pages = 59–65| year = 2009| pmid = 19225307| doi = 10.1097/MOO.0b013e3283200017| s2cid = 35820893}}</ref><ref name="SchievinkMoser2007">{{Cite journal | last1 = Schievink | first1 = W. I. | last2 = Moser | first2 = F. G. | last3 = Pikul | first3 = B. K. | title = Reversal of coma with an injection of glue | journal = The Lancet | volume = 369 | issue = 9570 | pages = 1402 | year = 2007 | doi = 10.1016/S0140-6736(07)60636-9 | pmid=17448827| s2cid = 5350377 }}</ref>

==Pathophysiology==
Cerebrospinal fluid is produced by the [[choroid plexus]] in the [[ventricular system|ventricles]] of the brain and contained by the dura and arachnoid layers of the meninges.<ref name="Schievink2000"/><ref name="Schievink2006"/><ref name="SchuenkeSchumacher2007">{{cite book|author1=Michael Schuenke|author2=Udo Schumacher|author3=Erik Schulte |author4=Edward D. Lamperti |author5=Lawrence M. Ross|title=Head and neuroanatomy|url=https://books.google.com/books?id=Y0-Rf_m7xj4C|access-date=8 November 2010|year=2007|publisher=Thieme|isbn=978-3-13-142101-2}}</ref> The brain floats in CSF, which also transports nutrients to the brain and spinal cord. As holes form in the spinal dura mater, CSF leaks out into the surrounding space. The CSF is then absorbed into the spinal epidural [[venous plexus]] or soft tissues around the spine.<ref name="Schievink2008"/><ref name="Inamasu">{{Cite journal | doi = 10.1016/j.spinee.2005.12.026 | title = Intracranial hypotension with spinal pathology | year = 2006 | last1 = Inamasu | first1 = J. | last2 = Guiot | first2 = B. | journal = The Spine Journal | volume = 6 | pages = 591–9| pmid = 16934734 | issue = 5 }}</ref> Due to the sterile conditions of the soft tissues around the spine, there is no risk of meningitis.<ref name="Schievink2008"/>

Lack of CSF pressure and volume can allow the brain to sag and descend through the [[foramen magnum]] (large opening) of the [[occipital bone]], at the base of the skull. The lower portion of the brain is believed to stretch or impact one or more [[cranial nerve]] complexes, thereby causing a variety of sensory symptoms. Nerves that can be affected and their related symptoms are detailed in the table at right.<ref name="Schievink2000"/><ref name="Schievink2008"/><ref name="VictorsandAdams2005" />


==Diagnosis==
==Diagnosis==
Diagnosis of CSF leakage can be done by various imaging techniques, chemical [[assay|tests]] of bodily fluid discharged from a head orifice, or [[physical examination|clinical examination]]. The use of [[CT scan|CT]], [[Magnetic resonance imaging|MRI]], and assays are the most common types of CSF leak instrumental tests. Many CSF leaks do not show up on imaging and chemical assays, thus such diagnostic tools are not definitive to rule out CSF leaks. A clinician may often depend upon patient history and exam to diagnose, for example: discharge of excessive amount of clear fluid from the nose upon bending over, the increase in headache following a [[Valsalva maneuver]] or the reduction of headache when the patient takes a prone position are positive indicators.
CSF leaks are frequently misdiagnosed as [[migraine]], [[Chiari malformation]], [[dysautonomia]] or [[conversion disorder]]. {{citation needed|date=December 2020}}

A clinical exam is often used as a means to diagnose CSF leaks. Improved patient response to conservative treatment may further define a positive diagnosis. The lack of clinician awareness of the signs -symptoms and ailments- of a CSF leak is the greatest challenge to proper diagnosis and treatment, in particular: the loss of the orthostatic characteristic of headache and that every chronic CSF leaker will have a unique symptom set that as a whole contributes to the underlying condition, and diagnosis of, a CSF leak.

The primary place of first complaint to a physician is a hospital emergency room.<ref name="Vaidhyanath"/><ref name="Schievink2007A">{{Cite journal | last1 = Schievink | first1 = W. I. | last2 = Maya | first2 = M. M. | last3 = Moser | first3 = F. | last4 = Tourje | first4 = J. | last5 = Torbati | first5 = S. | title = Frequency of spontaneous intracranial hypotension in the emergency department | journal = [[The Journal of Headache and Pain]] | volume = 8 | issue = 6 | pages = 325–328 | year = 2007 | pmid = 18071632 | doi = 10.1007/s10194-007-0421-8 | pmc=3476164}}</ref> Up to 94% of those suffering from SCSFLS are initially misdiagnosed. Incorrect diagnoses include [[migraine]]s, [[meningitis]], [[Chiari malformation]], and [[psychiatric disorder]]s. The average time from onset of symptoms until definitive diagnosis is 13 months.<ref name= "Schievink2003">{{Cite journal | doi = 10.1001/archneur.60.12.1713 | title = Misdiagnosis of Spontaneous Intracranial Hypotension | year = 2003 | last1 = Schievink | first1 = W. I. | journal = Archives of Neurology | volume = 60 | pages = 1713–8 | pmid = 14676045 | issue = 12| doi-access = free }}</ref> A 2007 study found a 0% success rate for proper diagnosis in the emergency department.<ref name="Schievink2007A"/>

===CT===
{{main|Computed tomography of the head}}

Diagnosis of a cerebrospinal fluid leak is performed through a combination of [[Non-invasive intracranial pressure measurement methods#See also|measurement]] of the CSF pressure and a [[computed tomography]] [[myelogram]] (CTM) scan of the spinal column for fluid leaks.<ref name="Schievink2008"/> The opening fluid pressure in the spinal canal is obtained by performing a [[lumbar puncture]], also known as a spinal tap. Once the pressure is measured, a [[radiocontrast agent]] is injected into the spinal fluid. The contrast then diffuses out through the dura sac before leaking through dural holes. This allows for a CTM with [[fluoroscopy]] to locate and image any sites of dura rupture via contrast seen outside the dura sac in the imagery.<ref name="Schievink2000"/><ref name="Hoffman2009">{{Cite journal| last1 = Hofmann | first1 = E.| last2 = Behr | first2 = R.| last3 = Schwager | first3 = K.| title = Imaging of cerebrospinal fluid leaks| journal = Klinische Neuroradiologie| volume = 19| issue = 2| pages = 111–121| year = 2009| pmid = 19636501| doi = 10.1007/s00062-009-9008-x | s2cid = 13544316}}</ref><ref name="Schievink2006"/>

===MRI===
{{main|Magnetic resonance imaging of the brain}}

There is disagreement over whether MRI should be the diagnostic tool of choice.<ref name="Schievink2008"/><ref name="spears2014" /><ref name="Schievink2006"/> [[Magnetic resonance imaging]] is less effective than CT at directly imaging sites of CSF leak. MRI studies may show pachymeningeal enhancement (when the dura mater looks thick and inflamed), sagging of the brain, [[pituitary]] enlargement, [[subdural hygroma]]s, engorgement of [[Dural venous sinuses|cerebral venous sinuses]], and other abnormalities.<ref name="spears2014" /> For 20% of patients, MRIs present as completely normal.<ref name="spears2014" /> MRIs performed with the patient seated upright (vs. laying supine) are not better for diagnosing CSF leaks,<ref name="Schievink2007B">{{Cite journal | journal = Headache: The Journal of Head and Face Pain | first2 = J. | volume = 47 | issue = 9 | pages = 1345–6 | last2 = Tourje | first1 = W. I. | pmid = 17927653 | title = Upright MRI in Spontaneous Spinal Cerebrospinal Fluid Leaks and Intracranial Hypotension | year = 2007 | last1 = Schievink | doi = 10.1111/j.1526-4610.2007.00934.x | s2cid = 19223351 }}</ref> but are more than twice as effective at diagnosing cerebellar tonsillar ectopia, also known as [[Chiari malformation]].<ref name="Freeman">{{cite journal|last1=Freeman|first1=MD|last2=Rosa|first2=S|last3=Harshfield|first3=D|last4=Smith|first4=F|last5=Bennett|first5=R|last6=Centeno|first6=C. J.|last7=Kornel|first7=E|last8=Nystrom|first8=A|last9=Heffez|first9=D|last10=Kohles|first10=S. S.|title=A case-control study of cerebellar tonsillar ectopia (Chiari) and head/neck trauma (whiplash)|journal=Brain Injury|date=2010|volume=24|issue=7–8|pages=988–94|doi=10.3109/02699052.2010.490512|pmid=20545453|s2cid=9553904}}</ref> Cerebellar tonsillar ectopia shares many of the same symptoms as CSF leak,<ref name="medscape.com">{{cite web|url=http://www.medscape.com/viewarticle/405623_2|title=Spontaneous Spinal Cerebrospinal Fluid Leaks: Diagnosis}}</ref> but originates either congenitally or from trauma, including [[Whiplash (medicine)|whiplash strain]] to the dura.<ref name="Freeman"/>

An alternate method of locating the site of a CSF leak is to use [[Mri#T2-weighted MRI|heavily T2-weighted MR myelography]].<ref name="Schievink2008"/> This has been effective in identifying the sites of a CSF leak without the need for a CT scan, lumbar puncture, and contrast and at locating fluid collections such as CSF pooling.<ref name="Wang2009">{{Cite journal | doi = 10.1212/WNL.0b013e3181c3fd99 | title = Heavily T2-weighted MR myelography vs CT myelography in spontaneous intracranial hypotension | year = 2009 | last1 = Wang | first1 = Y. -F. | last2 = Lirng | first2 = J. -F. | last3 = Fuh | first3 = J. -L. | last4 = Hseu | first4 = S. -S. | last5 = Wang | first5 = S. -J. | journal = Neurology | volume = 73 | pages = 1892–8| pmid = 19949036 | issue = 22 | s2cid = 22189395 }}</ref> Another highly successful method of locating a CSF leak is intrathecal contrast and MR Myelography.<ref name="Schievink2008"/>


Routine imaging assessment uses contrast-enhanced brain MRI with sagittal reformats.:<ref name=":0" /><ref name=":2">{{Cite journal|last1=Kranz|first1=Peter G.|last2=Gray|first2=Linda|last3=Malinzak|first3=Michael D.|last4=Amrhein|first4=Timothy J.|date=2019-11-01|title=Spontaneous Intracranial Hypotension: Pathogenesis, Diagnosis, and Treatment|journal=Neuroimaging Clinics of North America|series=Minimally Invasive Image-Guided Spine Interventions|language=en|volume=29|issue=4|pages=581–594|doi=10.1016/j.nic.2019.07.006|pmid=31677732|issn=1052-5149}}</ref> Imaging can assess for the following:
Contrast-enhanced brain MRI with sagittal reformats can assess for the following:<ref name=":0" /><ref name=":2">{{Cite journal|last1=Kranz|first1=Peter G.|last2=Gray|first2=Linda|last3=Malinzak|first3=Michael D.|last4=Amrhein|first4=Timothy J.|date=2019-11-01|title=Spontaneous Intracranial Hypotension: Pathogenesis, Diagnosis, and Treatment|journal=Neuroimaging Clinics of North America|series=Minimally Invasive Image-Guided Spine Interventions|language=en|volume=29|issue=4|pages=581–594|doi=10.1016/j.nic.2019.07.006|pmid=31677732|issn=1052-5149}}</ref>
* Subdural fluid collections
* Subdural fluid collections
* Enhancement of the meninges
* Enhancement of the meninges
Line 55: Line 156:
For suspected spinal CSF leaks, spine imaging can be used to guide treatment.<ref name=":2" />
For suspected spinal CSF leaks, spine imaging can be used to guide treatment.<ref name=":2" />


===Assay===
Other [[Medical imaging|imaging]] can be helpful in diagnosing a CSF leak, and in identifying its location, typically using a [[CT scan]] or an [[Magnetic resonance imaging|MRI scan]]. A [[Myelography|myelogram]] can be used to more precisely identify the location of a CSF leak by injecting a dye to further enhance the imaging. However, CSF leaks are frequently not visible on imaging.{{citation needed|date=December 2020}}
Fluid dripping from the nose ([[Cerebrospinal fluid rhinorrhoea|CSF rhinorrhoea]]) or ears (CSF otorrhea) should be collected and tested for the protein [[Beta-2 transferrin]] which would be highly accurate in identifying CS fluid and diagnosing a cranial CSF leak.<ref>{{Cite journal|last1=O'Cearbhaill|first1=Roisin M.|last2=Kavanagh|first2=Eoin C.|date=March 2018|title=Beta-2 Transferrin and IR|journal=Journal of Vascular and Interventional Radiology: JVIR|volume=29|issue=3|pages=439|doi=10.1016/j.jvir.2017.10.002|issn=1535-7732|pmid=29455884}}</ref><ref name="Abuabara">{{Cite journal | pmid = 17767107 | year = 2007 | last1 = Abuabara | first1 = A | title = Cerebrospinal fluid rhinorrhoea: diagnosis and management | volume = 12 | issue = 5 | pages = E397–400 | journal = Medicina Oral, Patologia Oral y Cirugia Bucal}}</ref>


===CSF analysis===
For patients with recalcitrant spontaneous intracranial hypotension and no leak found on conventional spinal imaging, digital subtraction myelography, CT myelography and dynamic myelography (a modified conventional myelography technique) should be considered to rule out a CSF-venous fistula.<ref>{{Cite journal|last1=Schievink|first1=Wouter I.|last2=Moser|first2=Franklin G.|last3=Maya|first3=M. Marcel|last4=Prasad|first4=Ravi S.|date=June 2016|title=Digital subtraction myelography for the identification of spontaneous spinal CSF-venous fistulas|journal=Journal of Neurosurgery. Spine|volume=24|issue=6|pages=960–964|doi=10.3171/2015.10.SPINE15855|issn=1547-5646|pmid=26849709|doi-access=free}}</ref><ref name=":1" /> In addition, presence of a hyperdense paraspinal vein should be investigated in imaging as it is highly suggestive of a CSF venous fistula.<ref>{{Cite journal|last1=Clark|first1=Michael S.|last2=Diehn|first2=Felix E.|last3=Verdoorn|first3=Jared T.|last4=Lehman|first4=Vance T.|last5=Liebo|first5=Greta B.|last6=Morris|first6=Jonathan M.|last7=Thielen|first7=Kent R.|last8=Wald|first8=John T.|last9=Kumar|first9=Neeraj|last10=Luetmer|first10=Patrick H.|date=January 2018|title=Prevalence of hyperdense paraspinal vein sign in patients with spontaneous intracranial hypotension without dural CSF leak on standard CT myelography|journal=Diagnostic and Interventional Radiology (Ankara, Turkey)|volume=24|issue=1|pages=54–59|doi=10.5152/dir.2017.17220|issn=1305-3612|pmc=5765931|pmid=29217497}}</ref>
[[File:Spinal needles.jpg|thumb|right|Spinal needles used in [[lumbar puncture]] and introduction of contrast into the spine]]
Patients with CSF leaks have been noted to have very low or even negative opening pressures during [[lumbar puncture]]. However, patients with confirmed CSF leaks may also demonstrate completely normal opening pressures. In 18–46% of cases, the CSF pressure is measured within the normal range.<ref name="Schievink2008"/><ref name="CSF hypovolemia vs intracranial hypotension in spontaneous intracranial hypotension syndrome.">{{Cite journal | pmid = 15111706 | year = 2004 | last1 = Kelley | first1 = G | title = CSF hypovolemia vs intracranial hypotension in "spontaneous intracranial hypotension syndrome" | volume = 62 | issue = 8 | pages = 1453 | journal = Neurology| doi=10.1212/wnl.62.8.1453| s2cid = 35100816 }}</ref><ref name="CSF volume loss in spontaneous intracranial hypotension.">{{Cite journal | pmid = 15249640 | year = 2004 | last1 = Canas | first1 = N | last2 = Medeiros | first2 = E | last3 = Fonseca | first3 = AT | last4 = Palma-Mira | first4 = F | title = CSF volume loss in spontaneous intracranial hypotension | volume = 63 | issue = 1 | pages = 186–7 | journal = Neurology| doi=10.1212/01.wnl.0000132964.07982.cc| s2cid = 43332925 }}</ref><ref name="Greenberg2006">{{cite book|author=Mark S. Greenberg|title=Handbook of neurosurgery |url=https://books.google.com/books?id=ExHcxxufG8sC&pg=PA178|access-date=8 November 2010|year=2006|publisher=Thieme|isbn=978-3-13-110886-9|pages=178–}}</ref> Analysis of spinal fluid may demonstrate [[lymphocytic pleocytosis]] and elevated protein content or [[xanthochromia]]. This is hypothesized to be due to increased permeability of dilated meningeal blood vessels and a decrease of CSF flow in the lumbar subarachnoid space.<ref name="Schievink2008"/>


===Myelography===
Fluid dripping from the nose ([[Cerebrospinal fluid rhinorrhoea|CSF rhinorrhoea]]) or ears (CSF otorrhea) should be collected and tested for the protein Beta-2 transferrin which would be highly accurate in identifying CS fluid and diagnosing a cranial CSF leak.<ref>{{Cite journal|last1=O'Cearbhaill|first1=Roisin M.|last2=Kavanagh|first2=Eoin C.|date=March 2018|title=Beta-2 Transferrin and IR|journal=Journal of Vascular and Interventional Radiology: JVIR|volume=29|issue=3|pages=439|doi=10.1016/j.jvir.2017.10.002|issn=1535-7732|pmid=29455884}}</ref>
A [[Myelography|myelogram]] can be used to more precisely identify the location of a CSF leak by injecting a dye to further enhance the imaging. However, CSF leaks are frequently not visible on imaging.{{citation needed|date=December 2020}}

For patients with recalcitrant spontaneous intracranial hypotension and no leak found on conventional spinal imaging, digital subtraction myelography, CT myelography and dynamic myelography (a modified conventional myelography technique) should be considered to rule out a CSF-venous fistula.<ref>{{Cite journal|last1=Schievink|first1=Wouter I.|last2=Moser|first2=Franklin G.|last3=Maya|first3=M. Marcel|last4=Prasad|first4=Ravi S.|date=June 2016|title=Digital subtraction myelography for the identification of spontaneous spinal CSF-venous fistulas|journal=Journal of Neurosurgery. Spine|volume=24|issue=6|pages=960–964|doi=10.3171/2015.10.SPINE15855|issn=1547-5646|pmid=26849709|doi-access=free}}</ref><ref name=":1" /> In addition, presence of a hyperdense paraspinal vein should be investigated in imaging as it is highly suggestive of a CSF venous fistula.<ref>{{Cite journal|last1=Clark|first1=Michael S.|last2=Diehn|first2=Felix E.|last3=Verdoorn|first3=Jared T.|last4=Lehman|first4=Vance T.|last5=Liebo|first5=Greta B.|last6=Morris|first6=Jonathan M.|last7=Thielen|first7=Kent R.|last8=Wald|first8=John T.|last9=Kumar|first9=Neeraj|last10=Luetmer|first10=Patrick H.|date=January 2018|title=Prevalence of hyperdense paraspinal vein sign in patients with spontaneous intracranial hypotension without dural CSF leak on standard CT myelography|journal=Diagnostic and Interventional Radiology (Ankara, Turkey)|volume=24|issue=1|pages=54–59|doi=10.5152/dir.2017.17220|issn=1305-3612|pmc=5765931|pmid=29217497}}</ref>


==Treatment==
==Treatment==
Symptomatic treatment usually involves [[analgesics]] for both cranial and spinal CSF leaks. Initial measures can include rest, [[caffeine]] intake (via [[coffee]] or [[intravenous]] infusion), and hydration.<ref name="spears2014" /> [[Corticosteroid]]s may provide transient relief for some patients.<ref name="spears2014" /> An [[abdominal binder]], which increases intracranial pressure by compressing the abdomen, can temporarily relieve symptoms for some people.<ref name="schievink2014">{{cite journal |author=Schievink, W. I. |author2=Deline, C. R. | year = 2014 | title = Headache secondary to intracranial hypotension | journal = Current Pain and Headache Reports | volume = 18 | issue = 457 | pages = 1–9 | doi = 10.1007/s11916-014-0457-9| pmid = 25255993 |s2cid=19577501 }}</ref> Sometimes a CSF leak will heal on its own. Otherwise, symptoms may last months or even years.
Symptomatic treatment usually involves [[analgesics]] for both cranial and spinal CSF leaks. [[Caffeine]] and short-term [[bed rest]] can alleviate symptoms of low CSF pressure, while elevated rest and [[acetazolamide]] can alleviate symptoms of high CSF pressure.{{citation needed|date=December 2020}}


===Epidural blood patch===
Sometimes a CSF leak will heal on its own. Otherwise, symptoms may last months or even years. An [[epidural blood patch]] is the typical treatment for a CSF leak, where up to 20 [[Cubic centimetre|cubic centimeters]] of the patient's blood is drawn, then injected into either the [[lumbar]] or [[cervical spine]], close to the known or suspected site of the leak. [[Fibrin glue]] patching is an alternative where blood patching is unsuccessful. If the site of the leak is known, [[neurosurgical]] repair of the [[dura mater]] is an option.{{citation needed|date=December 2020}}
[[File:Epidural blood patch.svg|thumb|right|The epidural syringe is filled with [[Autotransplantation#Autologous blood donation|autologous blood]] and injected in the epidural space in order to close holes in the dura mater.]]
The treatment of choice for this condition is the surgical application of [[epidural blood patch]]es,<ref name="Mehta">{{Cite journal | doi = 10.1007/s12630-009-9121-y | pmid = 19495908 | title = Repeated large-volume epidural blood patches for the treatment of spontaneous intracranial hypotension | year = 2009 | last1 = Mehta | first1 = B. | last2 = Tarshis | first2 = J. | journal = Canadian Journal of Anesthesia | volume = 56 | issue = 8 | pages = 609–13 | doi-access = free }}</ref><ref name="Peng2008">{{Cite journal| pmid = 18380287| year = 2008| last1 = Peng| first1 = PW| last2 = Farb| title = Spontaneous C1-2 CSF leak treated with high cervical epidural blood patch| volume = 35| issue = 1| pages = 102–5| journal = The Canadian Journal of Neurological Sciences| doi=10.1017/s0317167100007654| doi-access = free}}</ref><ref name="Spontaneous low cerebrospinal pressure: a mini review.">{{Cite journal | doi = 10.1007/s10072-004-0272-x | title = Spontaneous low cerebrospinal pressure: a mini review | year = 2004 | first11 = G. | last1 = Grimaldi | last11 = Bussone | first1 = D. | last2 = Mea | first10 = M. | first2 = E. | last3 = Chiapparini | first3 = L. | last4 = Ciceri | first4 = E. | last10 = Leone | last5 = Nappini | first5 = S. | last6 = Savoiardo | first6 = M. | last7 = Castelli | first7 = M. | last8 = Cortelli | first8 = P. | last9 = Carriero | first9 = M. R. | journal = Neurological Sciences | volume = 25 | issue = S3 | pages = S135–S137| pmid = 15549523 | s2cid = 8388459 }}</ref> which has a higher success rate than conservative treatments of bed rest and hydration.<ref name="Spontaneous intracranial hypotension treated by epidural blood patches.">{{Cite journal | last3 = Hseu | first2 = J. | last2 = Lirng | first3 = S. | last4 = Chan | issue = 3 | first4 = K.| pmid = 18809524 | pages = 129–133 | year = 2008 | title = Spontaneous Intracranial Hypotension Treated by Epidural Blood Patches | last1 = Wang | first1 = S. | volume = 46 | journal = Acta Anaesthesiologica Taiwanica | doi = 10.1016/S1875-4597(08)60007-7 | doi-access = free }}</ref> Through the injection of a person's own blood into the area of the hole in the dura, an epidural blood patch uses blood's [[clotting factors]] to clot the sites of holes. The volume of [[Autotransplantation#Autologous blood donation|autologous blood]] and number of patch attempts for patients is highly variable.<ref name="Mehta"/> One-quarter to one-third of SCSFLS patients do not have relief of symptoms from epidural blood patching.<ref name="Schievink2008"/>


===Fibrin glue sealant===
Surgery to treat a CSF-venous fistula in CSF leak patients is highly effective.<ref>{{Cite journal|last1=Wang|first1=Timothy Y.|last2=Karikari|first2=Isaac O.|last3=Amrhein|first3=Timothy J.|last4=Gray|first4=Linda|last5=Kranz|first5=Peter G.|date=2020-03-01|title=Clinical Outcomes Following Surgical Ligation of Cerebrospinal Fluid-Venous Fistula in Patients With Spontaneous Intracranial Hypotension: A Prospective Case Series|journal=Operative Neurosurgery (Hagerstown, Md.)|volume=18|issue=3|pages=239–245|doi=10.1093/ons/opz134|issn=2332-4260|pmid=31134267|doi-access=free}}</ref>
If blood patches alone do not succeed in closing the dural tears, placement of percutaneous [[fibrin glue]] can be used in place of blood patching, raising the effectiveness of forming a clot and arresting CSF leakage.<ref name="Gordon"/><ref name="Schievink2008"/><ref name="Schievink2004">{{Cite journal | last1 = Schievink | first1 = W. I. | last2 = Maya | first2 = M. M. | last3 = Moser | first3 = F. M. | title = Treatment of spontaneous intracranial hypotension with percutaneous placement of a fibrin sealant | journal = Journal of Neurosurgery | volume = 100 | issue = 6 | pages = 1098–1100 | year = 2004 | doi = 10.3171/jns.2004.100.6.1098 | pmid=15200130}}</ref>



===Surgical drain technique===
In extreme cases of intractable CSF leak, a surgical [[drain (surgery)|lumbar drain]] has been used.<ref name="A novel technique for treatment of intractable spontaneous intracranial hypotension: lumbar dural reduction surgery."/><ref name="Closed subarachnoid drainage for management of cerebrospinal fluid leakage after an operation on the spine.">{{Cite journal | pmid = 2760094 | year = 1989 | last1 = Kitchel | first1 = SH | last2 = Eismont | first2 = FJ | last3 = Green | first3 = BA | title = Closed subarachnoid drainage for management of cerebrospinal fluid leakage after an operation on the spine | volume = 71 | issue = 7 | pages = 984–7 | journal = The Journal of Bone and Joint Surgery. American Volume | doi=10.2106/00004623-198971070-00004}}</ref><ref name="The paradox of intracranial hypotension responding well to CSF drainage." /> This procedure is believed to decrease spinal CSF volume while increasing intracranial CSF pressure and volume.<ref name="A novel technique for treatment of intractable spontaneous intracranial hypotension: lumbar dural reduction surgery."/> This procedure restores normal intracranial CSF volume and pressure while promoting the healing of dural tears by lowering the pressure and volume in the dura.<ref name="A novel technique for treatment of intractable spontaneous intracranial hypotension: lumbar dural reduction surgery."/><ref name="The paradox of intracranial hypotension responding well to CSF drainage.">{{Cite journal | doi = 10.1111/j.1468-1331.2009.02803.x | title = The paradox of intracranial hypotension responding well to CSF drainage | year = 2009 | last1 = Roosendaal | first1 = C. M. | last2 = Coppes | first2 = M. H. | last3 = Vroomen | first3 = P. C. A. J. | journal = European Journal of Neurology | volume = 16 | pages = e178–9| pmid = 19863649 | issue = 12 | s2cid = 6165146 }}</ref> This procedure has led to positive results leading to relief of symptoms for up to one year.<ref name="A novel technique for treatment of intractable spontaneous intracranial hypotension: lumbar dural reduction surgery."/><ref name="Closed subarachnoid drainage for management of cerebrospinal fluid leakage after an operation on the spine." />

===Neurosurgical repair===
Surgery to treat a CSF-venous fistula in CSF leak patients is highly effective.<ref>{{Cite journal|last1=Wang|first1=Timothy Y.|last2=Karikari|first2=Isaac O.|last3=Amrhein|first3=Timothy J.|last4=Gray|first4=Linda|last5=Kranz|first5=Peter G.|date=2020-03-01|title=Clinical Outcomes Following Surgical Ligation of Cerebrospinal Fluid-Venous Fistula in Patients With Spontaneous Intracranial Hypotension: A Prospective Case Series|journal=Operative Neurosurgery (Hagerstown, Md.)|volume=18|issue=3|pages=239–245|doi=10.1093/ons/opz134|issn=2332-4260|pmid=31134267|doi-access=free}}</ref> Neurosurgery is available to directly repair leaking meningeal [[diverticulum|diverticula]]. The areas of dura leak can be tied together in a process called [[Ligature (medicine)|ligation]] and then a metal clip can be placed in order to hold the ligation closed.<ref name="Schievink2008"/> Alternatively, a small compress called a [[wikt:pledget|pledget]] can be placed over the dura leak and then sealed with [[Embolization#Agents|gel foam]] and fibrin glue.<ref name="Schievink2008"/> Primary suturing is rarely able to repair a CSF leak, and in some patients exploration of the dura may be required to properly locate all sites of CSF leak.<ref name="Schievink2008"/>

===Adjunct measures===
The use of [[antibiotics]] to [[preventive healthcare|prevent]] meningitis in those with a CSF leak due to a [[skull fracture]] is of unclear benefit.<ref>{{cite journal |last1=Ratilal |first1=BO |last2=Costa |first2=J |last3=Pappamikail |first3=L |last4=Sampaio |first4=C |title=Antibiotic prophylaxis for preventing meningitis in patients with basilar skull fractures. |journal=The Cochrane Database of Systematic Reviews |date=28 April 2015 |issue=4 |pages=CD004884 |doi=10.1002/14651858.CD004884.pub4 |pmid=25918919}}</ref>
The use of [[antibiotics]] to [[preventive healthcare|prevent]] meningitis in those with a CSF leak due to a [[skull fracture]] is of unclear benefit.<ref>{{cite journal |last1=Ratilal |first1=BO |last2=Costa |first2=J |last3=Pappamikail |first3=L |last4=Sampaio |first4=C |title=Antibiotic prophylaxis for preventing meningitis in patients with basilar skull fractures. |journal=The Cochrane Database of Systematic Reviews |date=28 April 2015 |issue=4 |pages=CD004884 |doi=10.1002/14651858.CD004884.pub4 |pmid=25918919}}</ref>

==Prognosis==
Long-term outcomes for people with SCSFLS remain poorly studied.<ref name="Schievink2008"/> Symptoms may resolve in as little as two weeks, or persist for months.<ref name="spears2014" /> Less commonly, patients may suffer from unremitting symptoms for many years.<ref name="Schievink2000"/><ref name="spears2014" /><ref name="Schievink2006"/><ref name="Schwedt2007">{{Cite journal | pmid = 17214923 | year = 2007 | last1 = Schwedt | first1 = TJ | last2 = Dodick | first2 = DW | title = Spontaneous intracranial hypotension | volume = 11 | issue = 1 | pages = 56–61 | journal = Current Pain and Headache Reports | doi = 10.1007/s11916-007-0023-9| s2cid = 36869290 }}</ref> People with chronic SCSFLS may be disabled and unable to work.<ref name="Schievink2008"/><ref name="Mea"/> Recurrent CSF leak at an alternate site after recent repair is common.<ref name="SchievinkMaya2003">{{Cite journal | last1 = Schievink | first1 = W. I. | last2 = Maya | first2 = M. M. | last3 = Riedinger | first3 = M. | title = Recurrent spontaneous spinal cerebrospinal fluid leaks and intracranial hypotension: a prospective study | journal = Journal of Neurosurgery | volume = 99 | issue = 5 | pages = 840–842 | year = 2003 | doi = 10.3171/jns.2003.99.5.0840 | pmid=14609162}}</ref>

==Epidemiology==
A 1994 community-based study indicated that two out of every 100,000 people suffered from SCSFLS, while a 2004 [[emergency room]]-based study indicated five per 100,000.<ref name="Schievink2008"/><ref name="Schievink2006">{{Cite journal | last1 = Schievink | first1 = W. I.| year = 2006 | title = Spontaneous Spinal Cerebrospinal Fluid Leaks and Intracranial Hypotension| journal = Journal of the American Medical Association| volume = 295 | issue = 19 | pages = 2286–96| doi = 10.1001/jama.295.19.2286| pmid = 16705110 | doi-access = free}}</ref> SCSFLS generally affects the young and middle aged;<ref name="A novel technique for treatment of intractable spontaneous intracranial hypotension: lumbar dural reduction surgery.">{{Cite journal | doi = 10.1111/j.1526-4610.2009.01450.x | pmid = 19473279 | title = A Novel Technique for Treatment of Intractable Spontaneous Intracranial Hypotension: Lumbar Dural Reduction Surgery | year = 2009 | last1 = Schievink | first1 = W. I. | journal = Headache: The Journal of Head and Face Pain | volume = 49 | issue = 7 | pages = 1047–1051 | s2cid = 25817793 }}</ref> the average age for onset is 42.3 years, but onset can range from ages 22 to 61.<ref name="Schievink1998">{{Cite journal | doi = 10.3171/jns.1998.88.2.0243 | title = Surgical treatment of spontaneous spinal cerebrospinal fluid leaks | year = 1998 | last1 = Schievink | first1 = W. I. | last2 = Morreale | first2 = V. M. | last3 = Atkinson | first3 = J. L. D. | last4 = Meyer | first4 = F. B. | last5 = Piepgras | first5 = D. G. | last6 = Ebersold | first6 = M. J. | journal = Journal of Neurosurgery | volume = 88 | pages = 243–246| pmid = 9452231 | issue = 2 }}</ref> In an 11-year study, women were found to be twice as likely to be affected as men.<ref name="Spontaneous cerebrospinal fluid leak syndrome: report of 18 cases">{{Cite journal| last1 = Ferrante | first1 = E.| last2 = Wetzl | first2 = R.| last3 = Savino | first3 = A.| last4 = Citterio | first4 = A.| last5 = Protti | first5 = A.| title = Spontaneous cerebrospinal fluid leak syndrome: report of 18 cases| series = 25| journal = Neurological Sciences| volume = Suppl 3| issue = S3| pages = S293–S295| year = 2004| pmid = 15549566 | doi = 10.1007/s10072-004-0315-3 | s2cid = 19720469}}</ref><ref>{{Cite journal| issue = 2| volume = 112| journal = Journal of Neurosurgery| pages = 295–299| year = 2009| doi = 10.3171/2008.10.JNS08428| pmid = 19199465| title = Spontaneous spinal cerebrospinal fluid leaks as the cause of subdural hematomas in elderly patients on anticoagulation | first4 = C.| last2 = Maya | first1 = W. | first2 = M.| last3 = Pikul| last4 = Louy | first3 = B.| last1 = Schievink }}</ref>

Studies have shown that SCSFLS runs in families. It is suspected that genetic similarity in families includes weakness in the dura mater which leads to SCSFLS.<ref name="Schievink2008"/><ref name="Familial spontaneous intracranial hypotension">{{Cite journal | pmid = 19921558 | year = 2009 | last1 = Larrosa | first1 = D | last2 = Vázquez | first2 = J | last3 = Mateo | first3 = I | last4 = Infante | first4 = J | title = Familial spontaneous intracranial hypotension | volume = 24 | issue = 7 | pages = 485–7 | journal = Neurologia (Barcelona, Spain)}}</ref> Large scale population-based studies have not yet been conducted.<ref name="Schievink2006"/> While a majority of SCSFLS cases continue to be undiagnosed or misdiagnosed, an actual increase in occurrence is unlikely.<ref name="Schievink2006"/>

==History==
Spontaneous CSF leaks have been described by notable physicians and reported in medical journals dating back to the early 1900s.<ref>{{Cite journal| pmid = 13036182| year = 1953| last1 = Schaltenbrand| first1 = G| title = Normal and pathological physiology of the cerebrospinal fluid circulation| volume = 1| issue = 6765| pages = 805–8| journal = Lancet| doi = 10.1016/S0140-6736(53)91948-5}}</ref><ref name=Mokri2000>{{Cite journal| pmid = 16859267| year = 2000| last1 = Mokri| first1 = B| title = Cerebrospinal fluid volume depletion and its emerging clinical/imaging syndromes| volume = 9| issue = 1| pages = 1–7| journal = Neurosurgical Focus| doi = 10.3171/foc.2000.9.1.6| doi-access = free}}</ref> German neurologist Georg Schaltenbrand reported in 1938 and 1953 what he termed "aliquorrhea", a condition marked by very low, unobtainable, or even negative CSF pressures. The symptoms included orthostatic headaches and other features that are now recognized as spontaneous intracranial hypotension. A few decades earlier, the same syndrome had been described in French literature as "hypotension of spinal fluid" and "ventricular collapse". In 1940, [[Henry Woltman]] of the [[Mayo Clinic]] wrote about "headaches associated with decreased intracranial pressure". The full clinical manifestations of intracranial hypotension and CSF leaks were described in several publications reported between the 1960s and early 1990s.<ref name=Mokri2000 /> Modern reports of spontaneous CSF leak have been reported to medical journals since the late 1980s.<ref name="Treatment of spontaneous cerebrospinal fluid leak with epidural blood patch. Case report. Rupp & Wilson, 1989">{{Cite journal| last1 = Rupp | first1 = S. M.| last2 = Wilson | first2 = C. B.| title = Treatment of spontaneous cerebrospinal fluid leak with epidural blood patch| journal = Journal of Neurosurgery| volume = 70| issue = 5| pages = 808–10| year = 1989| pmid = 2709124| doi = 10.3171/jns.1989.70.5.0808}}</ref>

==Research==
[[Tetracosactide]] is a corticosteroid that causes the brain to produce additional spinal fluid to replace the volume of the lost CSF and alleviate symptoms, and has been given [[Intravenous therapy|intravenously]] to treat CSF leaks.<ref name="Use of intravenous cosyntropin in the treatment of postdural puncture headache.">{{Cite journal | pmid = 10638928 | year = 2000 | last1 = Carter | first1 = B. | last2 = Pasupuleti | first2 = R.| title = Use of intravenous cosyntropin in the treatment of postdural puncture headache | volume = 92 | issue = 1 | pages = 272–274 | journal = Anesthesiology | doi = 10.1097/00000542-200001000-00043}}</ref><ref name="Use of Intravenous Tetracosactin in the Treatment of Postdural Puncture Headache: Our Experience in Forty Cases">{{Cite journal | pmid = 11973227 | year = 2002 | last1 = Cánovas | first1 = L | last2 = Barros | first2 = C | last3 = Gómez | first3 = A | last4 = Castro | first4 = M | last5 = Castro | first5 = A | title = Use of intravenous tetracosactin in the treatment of postdural puncture headache: our experience in forty cases | volume = 94 | issue = 5 | pages = 1369 | journal = Anesthesia and Analgesia | doi = 10.1097/00000539-200205000-00069}}</ref>

In three small studies of 1-2 patients suffering from recurrent CSF leaks where repeated blood patches failed to form clots and relieve symptoms, the patients received temporary but complete resolution of symptoms with an epidural saline infusion.<ref name="Treatment of spontaneous intracranial hypotension by epidural saline infusion">{{Cite journal | journal = Revue Neurologique | first4 = M. | last4 = Madigand | volume = 165 | pages = 201–5 | issue = 2| pmid = 19010507 | first3 = R. | last3 = Choui | year = 2009 | title = Traitement de l'hypotension spontanée du liquide cérébrospinal par perfusion épidurale de sérum salé isotonique | last1 = Rouaud | first1 = T. | first2 = F. | last2 = Lallement | doi = 10.1016/j.neurol.2008.05.006 }}</ref><ref name="Binder2002">{{Cite journal | last1 = Binder | first1 = DK | last2 = Dillon | first2 = WP | last3 = Fishman | first3 = RA | last4 = Schmidt | first4 = MH | title = Intrathecal saline infusion in the treatment of obtundation associated with spontaneous intracranial hypotension: technical case report | journal = Neurosurgery | volume = 51 | issue = 3 | pages = 830–6; discussion 836–7 | year = 2002 | pmid = 12188967 | doi=10.1097/00006123-200209000-00045| s2cid = 9552160 }}</ref> The saline infusion temporarily restores the volume necessary for a patient to avoid SIH until the leak can be repaired properly.<ref name="Schievink2008"/> Intrathecal saline infusion is used in urgent cases such as intractable pain or decreased consciousness.<ref name="Schievink2008"/>

The gene [[TGFBR2]] has been implicated in several connective tissue disorders including [[Marfan syndrome]], [[arterial tortuosity]], and [[thoracic aortic aneurysm]]. A study of patients with SCSFLS demonstrated no mutations in this gene.<ref name="Schievink2008"/> Minor features of Marfan syndrome have been found in 20% of CSF leak patients. Abnormal findings of [[fibrillin-1]] have been documented in these CSF leak patients, but only one patient demonstrated a fibrillin-1 defect consistent with Marfan syndrome.<ref name="Schievink2008"/><ref name="SchrijverSchievink2002">{{Cite journal | last1 = Schrijver | first1 = I. | last2 = Schievink | first2 = W. I. | last3 = Godfrey | first3 = M. | last4 = Meyer | first4 = F. B. | last5 = Francke | first5 = U. | title = Spontaneous spinal cerebrospinal fluid leaks and minor skeletal features of Marfan syndrome: a microfibrillopathy | journal = Journal of Neurosurgery | volume = 96 | issue = 3 | pages = 483–9 | year = 2002 | pmid = 11883832 | doi = 10.3171/jns.2002.96.3.0483}}</ref>

==See also==
* [[Subdural effusion]]


==References==
==References==
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== External links ==
== External links ==
{{Medical resources
| DiseasesDB =
| ICD10 = {{ICD10|G|96|0|g|90}}, {{ICD10|G|97|0|g|90}}
| ICD9 = 339.8, 348.4, 349.0, 792.0
| ICDO =
| OMIM =
| MedlinePlus = 001068
| eMedicineSubj =
| eMedicineTopic =
| MeshID =
}}
{{CNS diseases of the nervous system}}
* [https://www.csfleak.info  CFS leak info]
* [https://www.csfleak.info  CFS leak info]
* [https://spinalcsfleak.org Spinal CSF leak]
* [https://spinalcsfleak.org Spinal CSF leak]

Revision as of 11:15, 15 May 2021

Cerebrospinal fluid leak
Other namesCSF leak
SpecialtyNeurology Edit this on Wikidata
Spontaneous cerebrospinal fluid leak
The spinal meninges of the central nervous system. The dura mater and arachnoid mater hold in CSF and are impacted by SCSFLS.
SpecialtyNeurology Edit this on Wikidata

A cerebrospinal fluid leak (CSF leak or CSFL) is a medical condition where the cerebrospinal fluid (CSF) surrounding the brain or spinal cord leaks out of one or more holes or tears in the dura mater.[1][2] A cerebrospinal fluid leak can be either cranial or spinal, and these are two different disorders.[3] A spinal CSF leak can be caused by one or more meningeal diverticula or CSF-venous fistulas not associated with an epidural leak.[4][5][6]

CSF leaks are either caused by trauma including that arising from medical interventions, or occur spontaneous (spontaneous cerebrospinal fluid leaks; sCSF leaks), sometimes in those with predisposing conditions. Traumatic causes include a lumbar puncture noted by a post-dural-puncture headache, and other trauma such as from a fall or accident. Spontaneous CSF leaks are associated with heritable connective tissue disorders including Marfan syndrome and Ehlers–Danlos syndromes.[7]

A loss of CSF greater than its rate of production leads to a decreased volume inside the skull known as intracranial hypotension.

Any CSF leak is most often characterized by orthostatic headaches, which worsen when standing, and improve when lying down. Other symptoms can include neck pain or stiffness, nausea, vomiting, dizziness, fatigue, and a metallic taste in the mouth. A CT scan can identify the site of a cerebrospinal fluid leakage. Once identified, the leak can often be repaired by an epidural blood patch, an injection of the patient's own blood at the site of the leak, a fibrin glue injection, or surgery.

The set of symptoms associated with a sCSF leak is referred to as a spontaneous cerebrospinal fluid leak syndrome (SCSFLS). A sCSF leak is uncommon but not rare, affecting at least one in 20,000 people and many more who go undiagnosed every year. On average, the condition develops at age 42, and women are twice as likely to be affected. Some people with a sCSF leak have a chronic leak of cerebrospinal fluid despite repeated patching attempts, leading to long-term disability due to pain and being unable to be upright, and surgery is often needed. SCSFLS was first described by German neurologist Georg Schaltenbrand in 1938 and by American neurologist Henry Woltman of the Mayo Clinic in the 1950s.

Classification

Spontaneous cerebrospinal fluid leaks are classified into two main types: cranial leaks,[8] and spinal leaks.[9] The vast majority of leaks are spinal.[10] Cranial leaks occur in the head, and in some of these cases, CSF can leak from the nose, or from the ear.[11] Spinal leaks occur when one or more holes form in the dura along the spinal cord.[9] Both cranial and spinal spontaneous CSF leaks cause neurological symptoms as well as spontaneous intracranial hypotension (SIH), diminished volume, and pressure of the cranium.[12] While this symptom can be referred to as intracranial hypotension, the intracranial pressure may be normal, with the underlying issue instead being low CSF volume. For this reason, a SCSFL is referred to as CSF hypovolemia as opposed to CSF hypotension.[13][14][15][16]

The diagnostic criteria for SCSFLS is based on the 2004 International Classification of Headache Disorders, 2nd edn (ICHD-II) (Table 1) (50) criteria. However, the presentation of patients with confirmed diagnosis may be very different from that of the clinical diagnostic criteria and cannot be considered authoritative.[17]

Signs and symptoms

Symptoms resulting from nerve impact[17]
Nerve Function Symptoms
optic
(2)
optic nerve
crossing
blurred and or
double vision
chorda tympani
(Branch of 7)
taste taste distortion
facial
(7)
facial nerve facial weakness
and numbness
vestibulocochlear
(8)
hearing,
balance
hearing and
balance problems
glossopharyngeal
(9)
taste taste distortion

The most common symptom of a CSF leak is a fast-onset, extremely painful orthostatic headache or thunderclap headache.[18][16][19] This headache is usually made worse by standing and typically becomes prominent throughout the day, with the pain becoming less severe when lying down.[20] Orthostatic headaches can become chronic and disabling to the point of incapacitation.[16][21][22][23] Some patients with a SCSFL will develop headaches that begin in the afternoon. This is known as second-half-of-the-day headache. This may be an initial presentation of a spontaneous CSF leak or appear after treatment such as an epidural patch, and likely indicates a slow CSF leak.[24]

A spinal leak may cause spontaneous intracranial hypotension (low CSF pressure) because the body cannot replenish the CSF fast enough to keep pace with the leak. As a result, the brain may sag inside the skull and into the foramen magnum, which is visible (and measurable) with an MRI of the brain. A cranial leak is more likely to cause intracranial hypertension (high CSF pressure), which carries a risk of meningitis. Both a cranial and spinal leak can fluctuate between high and low CSF pressure.[citation needed]

While high CSF pressure can make lying down unbearable, low CSF pressure due to a leak can be relieved by lying flat on the back.[25]

About 50% of people with a CSFL experience neck pain or stiffness, nausea, and vomiting.[26]

Other symptoms of a CSF leak include photophobia, dizziness and vertigo, gait disturbances, tinnitus, facial numbness or weakness, visual disturbances, brain fog, neuralgia, fatigue, fluid dripping from the nose or ears,[27][16]

Movement disorders are uncommon in spontaneous CSF leaks but occasionally can be one of the major components of the clinical presentation.[28]

An untreated CSF leak can result in coma or death.[29]

Causes

A spontaneous CSF leak is termed so as it has previously been thought to be idiopathic, meaning the cause is unknown.[23][30] The evidence of the last decade suggests however, that these leaks result from either a discogenic pathology, such as microspur, osteophyte or intra-dural disc herniation that pierces the dura like a knife, connective tissue disorder (which can often lead to discogenic pathology), or spinal drainage problems.[31][32]

A cerebrospinal fluid leak can be a rare complication of an anterior cervical discectomy and fusion (ACDF). One study suggested a CSF leak to follow from 0.5% of operations.[33] Another study suggests a CSF leak to follow from 1% of operations. In most of these cases repair is successful.[34]

Discogenic causes

The most common cause of an intractable "sCSF" leak is discogenic, either from an intra-dural disc herniation, osteophyte or microspur on the disc or vertebral body. "Recent radiological and microsurgical investigations revealed that a calcified, degenerative bony microspur is often the culprit lesion in cases of intractable CSF leaks. Arising from the level of the intervertebrate disk space, these microspurs pierce the ventral dura and produce a slit-like defect a few millimeters in length. These microspurs and the associated CSF leak have to be localized exactly, and then they are amenable to surgical treatment."[31][32]

Connective tissue theory

Various scientists and physicians have suggested that SCSFLs may be the result of an underlying connective tissue disorder affecting the spinal dura.[16][17][35][36] It may also run in families and be associated with aortic aneurysms and joint hypermobility.[17][37]

Up to two thirds of those affected demonstrate some type of generalized connective tissue disorder.[17][36] Marfan syndrome, Ehlers–Danlos syndrome, and autosomal dominant polycystic kidney disease are the three most common connective tissue disorders associated with SCSFLs.[17] Roughly 20% of patients with a SCSFL exhibit features of Marfan syndrome, including tall stature, hollowed chest (pectus excavatum), joint hypermobility and arched palate. However, no other Marfan syndrome presentations are shown.[17]

Spinal drainage theory

Some studies have proposed that issues with the spinal venous drainage system may cause a CSF leak.[38] According to this theory, dural holes and intracranial hypotension are symptoms caused by low venous pressure in the epidural space. When inferior limb muscles pump blood towards the heart and pressure in the inferior vena cava vein becomes negative, the network of epidural veins is overdrained, causing CSF to be aspirated into the epidural space. True leaks can form at weak points in the spinal meninges. Therefore, the observed CSF hypotension is a result of CSF hypovolemia and reduced epidural venous pressure.[38]

Other causes

Cranial CSF leaks result from intracranial hypertension in a vast majority of cases. The increased pressure causes a rupture of the cranial dura mater, leading to CSF leak and intracranial hypotension.[39][40] Patients with a nude nerve root, where the root sleeve is absent, are at increased risk for developing recurrent CSF leaks.[41] Lumbar disc herniation has been reported to cause CSF leaks in at least one case.[42] Degenerative spinal disc diseases cause a disc to pierce the dura mater, leading to a CSF leak.[17]

Complications

Arnold–Chiari malformation is a condition where the cerebellar tonsils have descended, and should be considered in differential diagnosis of SCSFLS

Several complications can occur as a result of SCSFLS including decreased cranial pressure, brain herniation, infection, blood pressure problems, transient paralysis, and coma. The primary and most serious complication of SCSFLS is spontaneous intracranial hypotension, where pressure in the brain is severely decreased.[16][35][43] This complication leads to the hallmark symptom of severe orthostatic headaches.[17][43]

People with cranial CSF leaks, the rarer form, have a 10% risk of developing meningitis per year.[44] If cranial leaks last more than seven days, the chances of developing meningitis are significantly higher.[44] Spinal CSF leaks cannot result in meningitis due to the sterile conditions of the leak site.[17] When a CSF leak occurs at the temporal bone, surgery becomes necessary in order to prevent infection and repair the leak.[45] Orthostatic hypotension is another complication that occurs due to autonomic dysfunction when blood pressure drops significantly.[46] The autonomic dysfunction is caused by compression of the brainstem, which controls breathing and circulation.[46]

Low CSF volume can cause the cerebellar tonsil position to descend, which can be mistaken for Chiari malformation; however when the CSF leak is repaired the tonsil position often returns to normal (as seen in upright MRI) in this "pseudo-Chiari" condition.[47] A further, albeit rare, complication of CSF leak is transient quadriplegia due to a sudden and significant loss of CSF. This loss results in hindbrain herniation and causes major compression of the upper cervical spinal cord. The quadriplegia dissipates once the patient lies supine.[48] An extremely rare complication of SCSFLS is third nerve palsy, where the ability to move one's eyes becomes difficult and interrupted due to compression of the third cranial nerve.[49]

There are documented cases of reversible frontotemporal dementia and coma.[50] Coma due to a CSF leak has been successfully treated by using blood patches and/or fibrin glue and placing the person in the Trendelenburg position.[51] Empty sella syndrome, a bony structure that surround the pituitary gland, occurs in CSF leak patients.[39][52]

Pathophysiology

Cerebrospinal fluid is produced by the choroid plexus in the ventricles of the brain and contained by the dura and arachnoid layers of the meninges.[16][35][53] The brain floats in CSF, which also transports nutrients to the brain and spinal cord. As holes form in the spinal dura mater, CSF leaks out into the surrounding space. The CSF is then absorbed into the spinal epidural venous plexus or soft tissues around the spine.[17][54] Due to the sterile conditions of the soft tissues around the spine, there is no risk of meningitis.[17]

Lack of CSF pressure and volume can allow the brain to sag and descend through the foramen magnum (large opening) of the occipital bone, at the base of the skull. The lower portion of the brain is believed to stretch or impact one or more cranial nerve complexes, thereby causing a variety of sensory symptoms. Nerves that can be affected and their related symptoms are detailed in the table at right.[16][17][23]

Diagnosis

Diagnosis of CSF leakage can be done by various imaging techniques, chemical tests of bodily fluid discharged from a head orifice, or clinical examination. The use of CT, MRI, and assays are the most common types of CSF leak instrumental tests. Many CSF leaks do not show up on imaging and chemical assays, thus such diagnostic tools are not definitive to rule out CSF leaks. A clinician may often depend upon patient history and exam to diagnose, for example: discharge of excessive amount of clear fluid from the nose upon bending over, the increase in headache following a Valsalva maneuver or the reduction of headache when the patient takes a prone position are positive indicators.

A clinical exam is often used as a means to diagnose CSF leaks. Improved patient response to conservative treatment may further define a positive diagnosis. The lack of clinician awareness of the signs -symptoms and ailments- of a CSF leak is the greatest challenge to proper diagnosis and treatment, in particular: the loss of the orthostatic characteristic of headache and that every chronic CSF leaker will have a unique symptom set that as a whole contributes to the underlying condition, and diagnosis of, a CSF leak.

The primary place of first complaint to a physician is a hospital emergency room.[19][55] Up to 94% of those suffering from SCSFLS are initially misdiagnosed. Incorrect diagnoses include migraines, meningitis, Chiari malformation, and psychiatric disorders. The average time from onset of symptoms until definitive diagnosis is 13 months.[56] A 2007 study found a 0% success rate for proper diagnosis in the emergency department.[55]

CT

Diagnosis of a cerebrospinal fluid leak is performed through a combination of measurement of the CSF pressure and a computed tomography myelogram (CTM) scan of the spinal column for fluid leaks.[17] The opening fluid pressure in the spinal canal is obtained by performing a lumbar puncture, also known as a spinal tap. Once the pressure is measured, a radiocontrast agent is injected into the spinal fluid. The contrast then diffuses out through the dura sac before leaking through dural holes. This allows for a CTM with fluoroscopy to locate and image any sites of dura rupture via contrast seen outside the dura sac in the imagery.[16][27][35]

MRI

There is disagreement over whether MRI should be the diagnostic tool of choice.[17][26][35] Magnetic resonance imaging is less effective than CT at directly imaging sites of CSF leak. MRI studies may show pachymeningeal enhancement (when the dura mater looks thick and inflamed), sagging of the brain, pituitary enlargement, subdural hygromas, engorgement of cerebral venous sinuses, and other abnormalities.[26] For 20% of patients, MRIs present as completely normal.[26] MRIs performed with the patient seated upright (vs. laying supine) are not better for diagnosing CSF leaks,[57] but are more than twice as effective at diagnosing cerebellar tonsillar ectopia, also known as Chiari malformation.[58] Cerebellar tonsillar ectopia shares many of the same symptoms as CSF leak,[47] but originates either congenitally or from trauma, including whiplash strain to the dura.[58]

An alternate method of locating the site of a CSF leak is to use heavily T2-weighted MR myelography.[17] This has been effective in identifying the sites of a CSF leak without the need for a CT scan, lumbar puncture, and contrast and at locating fluid collections such as CSF pooling.[59] Another highly successful method of locating a CSF leak is intrathecal contrast and MR Myelography.[17]

Contrast-enhanced brain MRI with sagittal reformats can assess for the following:[4][6]

  • Subdural fluid collections
  • Enhancement of the meninges
  • Engorgement of venous structures
  • Pituitary swelling
  • Sagging of the brain

For suspected spinal CSF leaks, spine imaging can be used to guide treatment.[6]

Assay

Fluid dripping from the nose (CSF rhinorrhoea) or ears (CSF otorrhea) should be collected and tested for the protein Beta-2 transferrin which would be highly accurate in identifying CS fluid and diagnosing a cranial CSF leak.[60][44]

CSF analysis

Spinal needles used in lumbar puncture and introduction of contrast into the spine

Patients with CSF leaks have been noted to have very low or even negative opening pressures during lumbar puncture. However, patients with confirmed CSF leaks may also demonstrate completely normal opening pressures. In 18–46% of cases, the CSF pressure is measured within the normal range.[17][61][62][63] Analysis of spinal fluid may demonstrate lymphocytic pleocytosis and elevated protein content or xanthochromia. This is hypothesized to be due to increased permeability of dilated meningeal blood vessels and a decrease of CSF flow in the lumbar subarachnoid space.[17]

Myelography

A myelogram can be used to more precisely identify the location of a CSF leak by injecting a dye to further enhance the imaging. However, CSF leaks are frequently not visible on imaging.[citation needed]

For patients with recalcitrant spontaneous intracranial hypotension and no leak found on conventional spinal imaging, digital subtraction myelography, CT myelography and dynamic myelography (a modified conventional myelography technique) should be considered to rule out a CSF-venous fistula.[64][5] In addition, presence of a hyperdense paraspinal vein should be investigated in imaging as it is highly suggestive of a CSF venous fistula.[65]

Treatment

Symptomatic treatment usually involves analgesics for both cranial and spinal CSF leaks. Initial measures can include rest, caffeine intake (via coffee or intravenous infusion), and hydration.[26] Corticosteroids may provide transient relief for some patients.[26] An abdominal binder, which increases intracranial pressure by compressing the abdomen, can temporarily relieve symptoms for some people.[66] Sometimes a CSF leak will heal on its own. Otherwise, symptoms may last months or even years.

Epidural blood patch

The epidural syringe is filled with autologous blood and injected in the epidural space in order to close holes in the dura mater.

The treatment of choice for this condition is the surgical application of epidural blood patches,[21][67][68] which has a higher success rate than conservative treatments of bed rest and hydration.[69] Through the injection of a person's own blood into the area of the hole in the dura, an epidural blood patch uses blood's clotting factors to clot the sites of holes. The volume of autologous blood and number of patch attempts for patients is highly variable.[21] One-quarter to one-third of SCSFLS patients do not have relief of symptoms from epidural blood patching.[17]

Fibrin glue sealant

If blood patches alone do not succeed in closing the dural tears, placement of percutaneous fibrin glue can be used in place of blood patching, raising the effectiveness of forming a clot and arresting CSF leakage.[9][17][70]


Surgical drain technique

In extreme cases of intractable CSF leak, a surgical lumbar drain has been used.[71][72][73] This procedure is believed to decrease spinal CSF volume while increasing intracranial CSF pressure and volume.[71] This procedure restores normal intracranial CSF volume and pressure while promoting the healing of dural tears by lowering the pressure and volume in the dura.[71][73] This procedure has led to positive results leading to relief of symptoms for up to one year.[71][72]

Neurosurgical repair

Surgery to treat a CSF-venous fistula in CSF leak patients is highly effective.[74] Neurosurgery is available to directly repair leaking meningeal diverticula. The areas of dura leak can be tied together in a process called ligation and then a metal clip can be placed in order to hold the ligation closed.[17] Alternatively, a small compress called a pledget can be placed over the dura leak and then sealed with gel foam and fibrin glue.[17] Primary suturing is rarely able to repair a CSF leak, and in some patients exploration of the dura may be required to properly locate all sites of CSF leak.[17]

Adjunct measures

The use of antibiotics to prevent meningitis in those with a CSF leak due to a skull fracture is of unclear benefit.[75]

Prognosis

Long-term outcomes for people with SCSFLS remain poorly studied.[17] Symptoms may resolve in as little as two weeks, or persist for months.[26] Less commonly, patients may suffer from unremitting symptoms for many years.[16][26][35][46] People with chronic SCSFLS may be disabled and unable to work.[17][22] Recurrent CSF leak at an alternate site after recent repair is common.[76]

Epidemiology

A 1994 community-based study indicated that two out of every 100,000 people suffered from SCSFLS, while a 2004 emergency room-based study indicated five per 100,000.[17][35] SCSFLS generally affects the young and middle aged;[71] the average age for onset is 42.3 years, but onset can range from ages 22 to 61.[77] In an 11-year study, women were found to be twice as likely to be affected as men.[78][79]

Studies have shown that SCSFLS runs in families. It is suspected that genetic similarity in families includes weakness in the dura mater which leads to SCSFLS.[17][80] Large scale population-based studies have not yet been conducted.[35] While a majority of SCSFLS cases continue to be undiagnosed or misdiagnosed, an actual increase in occurrence is unlikely.[35]

History

Spontaneous CSF leaks have been described by notable physicians and reported in medical journals dating back to the early 1900s.[81][82] German neurologist Georg Schaltenbrand reported in 1938 and 1953 what he termed "aliquorrhea", a condition marked by very low, unobtainable, or even negative CSF pressures. The symptoms included orthostatic headaches and other features that are now recognized as spontaneous intracranial hypotension. A few decades earlier, the same syndrome had been described in French literature as "hypotension of spinal fluid" and "ventricular collapse". In 1940, Henry Woltman of the Mayo Clinic wrote about "headaches associated with decreased intracranial pressure". The full clinical manifestations of intracranial hypotension and CSF leaks were described in several publications reported between the 1960s and early 1990s.[82] Modern reports of spontaneous CSF leak have been reported to medical journals since the late 1980s.[83]

Research

Tetracosactide is a corticosteroid that causes the brain to produce additional spinal fluid to replace the volume of the lost CSF and alleviate symptoms, and has been given intravenously to treat CSF leaks.[84][85]

In three small studies of 1-2 patients suffering from recurrent CSF leaks where repeated blood patches failed to form clots and relieve symptoms, the patients received temporary but complete resolution of symptoms with an epidural saline infusion.[86][87] The saline infusion temporarily restores the volume necessary for a patient to avoid SIH until the leak can be repaired properly.[17] Intrathecal saline infusion is used in urgent cases such as intractable pain or decreased consciousness.[17]

The gene TGFBR2 has been implicated in several connective tissue disorders including Marfan syndrome, arterial tortuosity, and thoracic aortic aneurysm. A study of patients with SCSFLS demonstrated no mutations in this gene.[17] Minor features of Marfan syndrome have been found in 20% of CSF leak patients. Abnormal findings of fibrillin-1 have been documented in these CSF leak patients, but only one patient demonstrated a fibrillin-1 defect consistent with Marfan syndrome.[17][88]

See also

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