|Synonyms||pronounce = //|
|Different types of hypospadias|
|Specialty||Urology, medical genetics|
Hypospadias is a congenital disorder of the urethra where the urinary opening is not at the usual location on the head of the penis. It is the second-most common birth abnormality of the male reproductive system, affecting about one of every 250 males at birth. In roughly 90% of cases, the opening (meatus) is on or near the head of the penis (glans), referred to as distal hypospadias, while the remainder have proximal hypospadias with a meatus near or within the scrotum. Shiny tissue seen extending from the meatus to the tip of the glans, which would have made the urinary channel, is referred to as the urethral plate.
In most cases, the foreskin is also underdeveloped and does not wrap completely around the penis, leaving the underside of the glans penis uncovered. Also, a downward bending of the penis, commonly referred to as chordee, may occur. This is found in 10% of distal hypospadias and 50% of proximal hypospadias at the time of surgery. The scrotum may be higher than usual to either side of the penis, called penoscrotal transposition, adding to the abnormal overall appearance.
Hypospadias is thought to result from failure of the urinary channel to completely tubularize to the end of the penis; the cause is not known. Most often, it is the only abnormal finding, although in about 10% of cases, hypospadias may be part of a syndrome with multiple abnormalities.
The most common associated defect is an undescended testicle, which has been reported in around 3% of infants with distal hypospadias and 10% of those having proximal hypospadias. The combination of hypospadias and an undescended testicle sometimes indicates a disorder of sexual differentiation, and so additional testing may be recommended. Otherwise no blood tests or X-rays are routinely needed in newborns with hypospadias.
Hypospadias can be a symptom or indication of an intersex condition but the presence of hypospadias alone is not enough to classify as intersex. In most cases, hypospadias is not associated with any condition.
Hypospadias is usually diagnosed in the newborn nursery by the characteristic appearance of the penis. The urinary opening (“meatus”) is lower than normal, and most children have only partial development of the foreskin, lacking the normal covering for the glans on the underside. The abnormal “hooded” foreskin calls attention to the condition. However, not all newborns with partial foreskin development have hypospadias, as some have a normal urinary opening with a hooded foreskin, which is called “chordee without hypospadias”.
Megameatus with intact prepuce variant of hypospadias occurs when the foreskin is normal and the hypospadias is concealed. The condition is discovered during newborn circumcision or later in childhood when the foreskin begins to retract. A newborn with normal-appearing foreskin and a straight penis who is discovered to have hypospadias after a circumcision was started can have circumcision completed without worry for jeopardizing future hypospadias repair. Hypospadias is almost never discovered after a circumcision.
Surgery is usually recommended for hypospadias, with the goal to restore normal appearance and function to the penis. A urinary opening that is not surrounded by glans tissue is more likely to “spray” the urine, which can cause a man to sit to urinate because he cannot reliably stand and hit the toilet. Downward curvature of the penis can impair sexual activity as an adult.
Surgery extends the urinary channel to the end of the penis, straightens bending, and corrects the foreskin abnormality by either circumcision or by repairing it to look normal (“prepucioplasty”), depending on the desire of care-givers.
When the hypospadias is third degree (penoscrotal), or has associated birth defects such as chordee or cryptorchidism, the best management can be a more complicated decision. A karyotype and endocrine evaluation should be performed to detect intersex conditions or hormone deficiencies. If the penis is small, testosterone or human chorionic gonadotropin (hCG) injections may be given to enlarge it before surgery.
Surgical repair of severe hypospadias may require multiple procedures and mucosal grafting. Preputial skin is often used for grafting and circumcision should be avoided before repair. In a minority of patients with severe hypospadias, surgery produces unsatisfactory results, such as scarring, curvature, or formation of urethral fistulas, diverticula, or strictures. A fistula is an unwanted opening through the skin along the course of the urethra, and can result in urinary leakage or an abnormal stream. A diverticulum is an "outpocketing" of the lining of the urethra which interferes with urinary flow and may result in posturination leakage. A stricture is a narrowing of the urethra severe enough to obstruct flow. Reduced complication rates even for third-degree repair (e.g., fistula rates below 5%) have been reported in recent years from centers with the most experience, and surgical repair is now performed for the vast majority of infants with hypospadias.
Age at surgery
Hypospadias repair can be done in full-term, healthy infants at any time from 3 months of age. Premature babies generally have surgery done at 6 months or older. Using these guidelines, most babies can undergo repair as same-day surgery, without need to stay in the hospital afterwards.
The results of surgery are probably not influenced by the age at which repair is done, but older children are more likely to recall the event. Teens and adults typically spend one night in the hospital after surgery.
Hormones potentially increase the size of the penis, and have been used in children with proximal hypospadias who have a smaller penis. Numerous articles report testosterone injections or topical creams increase the length and circumference of the penis. However, few studies discuss the impact of this treatment on the success of corrective surgery, with conflicting results. Therefore, the role, if any, for preoperative hormone stimulation is not clear at this time.
Hypospadias repair is done under general anesthesia, most often supplemented by a nerve block to the penis or a caudal block to reduce the general anesthesia needed, and to minimize discomfort after surgery.
Many techniques have been used during the past 100 years to extend the urinary channel to the correct location. Today, the most common operation, known as the tubularized incised plate or “TIP” repair, rolls the urethral plate from the low meatus to the end of the glans. This procedure can be used for all distal hypospadias repairs, with complications afterwards expected in less than 10% of cases.
Less consensus exists regarding proximal hypospadias repair. TIP repair can be used when the penis is straight or has mild downward curvature, with success in 85%. Alternatively, the urinary channel can be reconstructed using the foreskin, with reported success in from 55% to 75%.
Most distal and many proximal hypospadias are corrected in a single operation. However, those with the most severe condition having a urinary opening in the scrotum and downward bending of the penis are often corrected in a two-stage operation. During the first operation the curvature is straightened. At the second, the urinary channel is completed.
Most children having hypospadias repair heal without complications. This is especially true for distal hypospadias operations, which are successful in over 90% of cases.
Problems that can arise include a small hole in the urinary channel below the meatus, called a fistula. The head of the penis, which is open at birth in children with hypospadias and is closed around the urinary channel at surgery, sometimes reopens, known as glans dehiscence. The new urinary opening can scar, resulting in meatal stenosis, or internal scarring can create a stricture, either of which cause partial blockage to urinating. If the new urinary channel balloons when urinating a child is diagnosed with a diverticulum.
Most complications are discovered within six months after surgery, although they occasionally are not found for many years. In general, when no problems are apparent after repair in childhood, new complications arising after puberty are uncommon. However, some problems that were not adequately repaired in childhood may become more pronounced when the penis grows at puberty, such as residual penile curvature or urine spraying due to glans dehiscence.
These complications are usually successfully corrected with another operation, most often delayed for at least six months after the last surgery to allow the tissues to heal sufficiently before attempting another repair. Using modern surgical techniques, a normal-appearing penis can usually be expected from hypospadias repair. Results when circumcision or foreskin reconstruction are done are the same, so care-givers can choose whichever option they wish. (Figure 4a, 4b)
While most hypospadias repairs are done in childhood, occasionally, an adult was not operated and then desires surgery because of urinary spraying or unhappiness with the appearance. Other adults wanting surgery have complications that were never fully corrected during childhood.
A direct comparison of surgical results in children versus adults found they had the same outcomes, and adults can undergo hypospadias repair or reoperations with good expectations for success.
Hypospadias is among the most common birth defects in the world and is said to be the second-most common birth defect in the male reproductive system, occurring once in every 250 males.
Due to variations in the reporting requirements of different national databases, data from such registries cannot be used to accurately determine either incidence of hypospadias or geographical variations in its occurrences.
- Pediatric urology
- Bladder exstrophy, cloacal exstrophy
- Perineal urethra, pseudovaginal perineoscrotal hypospadias
- Ambiguous genitalia, intersex, intersex surgery
- Androgen insensitivity syndrome
- Testicular dysgenesis syndrome
- Entry "hypospadias" in Merriam-Webster Online Dictionary.
- OED 2nd edition, 1989 as /hɪpəʊˈspeɪdɪəs/~/haɪpəʊˈspeɪdɪəs/
- Snodgrass, Warren (2012). "Chapter 130: Hypospadias". In Wein, Allan. Campbell-Walsh Urology, Tenth Edition. Elsevier. pp. 3503–3536. ISBN 978-1-4160-6911-9.
- King S & Beasley S (2012) [1st. Pub. 1986]. "Chapter 9.1:Surgical Conditions in Older Children". In South M. Practical Paediatrics, Seventh Edition. Churchill Livingstone, Elsevier. pp. 266–267. ISBN 978-0-702-04292-8.
- Snodgrass, Warren; et al. (2012). "Chapter 130: Hypospadias". In Wein, Allan. Campbell-Walsh Urology, Tenth Edition. Elsevier. pp. 3503–3536. ISBN 978-1-4160-6911-9.
- Snodgrass W, Prieto J (October 2009). "Straightening ventral curvature while preserving the urethral plate in proximal hypospadias repair". J. Urol. 182 (4 Suppl): 1720–5. doi:10.1016/j.juro.2009.02.084. PMID 19692004.
- Stoll C, Alembik Y, Roth MP, Dott B (September 1990). "Genetic and environmental factors in hypospadias". J. Med. Genet. 27 (9): 559–63. doi:10.1136/jmg.27.9.559. PMC 1017217. PMID 2231648.
- Calzolari E, Contiero MR, Roncarati E, Mattiuz PL, Volpato S (August 1986). "Aetiological factors in hypospadias". J. Med. Genet. 23 (4): 333–7. doi:10.1136/jmg.23.4.333. PMC 1049700. PMID 3746833.
- Wu, Hongfei; Wei, Zhang; M., Gu (2002). "Hypospadias and enlarged prostatic utricle". Chinese Journal of Urology. 12: 51–3.
- Kaefer M, Tobin MS, Hendren WH, Bauer SB, Peters CA, Atala A, Colodny AH, Mandell J, Retik AB (April 1997). "Continent urinary diversion: the Children's Hospital experience". J. Urol. 157 (4): 1394–9. doi:10.1016/S0022-5347(01)64998-X. PMID 9120962.
- Tarman GJ, Kaplan GW, Lerman SL, McAleer IM, Losasso BE (January 2002). "Lower genitourinary injury and pelvic fractures in pediatric patients". Urology. 59 (1): 123–6, discussion 126. doi:10.1016/S0090-4295(01)01526-6. PMID 11796295.
- Tidy, Colin (January 19, 2016). "Hypospadias". Patient. Patient Platform Ltd. Retrieved October 18, 2018.
- Snodgrass WT, Khavari R (July 2006). "Prior circumcision does not complicate repair of hypospadias with an intact prepuce". J. Urol. 176 (1): 296–8. doi:10.1016/S0022-5347(06)00564-7. PMID 16753427.
- Chalmers D, Wiedel CA, Siparsky GL, Campbell JB, Wilcox DT (May 2014). "Discovery of hypospadias during newborn circumcision should not preclude completion of the procedure". J. Pediatr. 164 (5): 1171–1174.e1. doi:10.1016/j.jpeds.2014.01.013. PMID 24534572.
- Warren T. Snodgrass (2013-05-13). Pediatric Urology: Evidence for Optimal Patient Management. Springer Science & Business Media. pp. 117–. ISBN 978-1-4614-6910-0.
- Bush N, Snodgrass W (August 2014). "Response to "Re: Snodgrass W, et al. Duration of follow-up to diagnose hypospadias urethroplasty complications. J Pediatr Urol 2014;10:783-784"". J Pediatr Urol. 10 (4): 784–5. doi:10.1016/j.jpurol.2014.04.022. PMID 24999242.
- Kaplan GW (September 2008). "Does administration of transdermal dihydrotestosterone gel before hypospadias repair improve postoperative outcomes?". Nat Clin Pract Urol. 5 (9): 474–5. doi:10.1038/ncpuro1178. PMID 18679395.
- Snodgrass WT, Bush N, Cost N (August 2010). "Tubularized incised plate hypospadias repair for distal hypospadias". J Pediatr Urol. 6 (4): 408–13. doi:10.1016/j.jpurol.2009.09.010. PMID 19837000.
- Wilkinson DJ, Farrelly P, Kenny SE (June 2012). "Outcomes in distal hypospadias: a systematic review of the Mathieu and tubularized incised plate repairs". J Pediatr Urol. 8 (3): 307–12. doi:10.1016/j.jpurol.2010.11.008. PMID 21159560.
- Castagnetti M, El-Ghoneimi A (October 2010). "Surgical management of primary severe hypospadias in children: systematic 20-year review". J. Urol. 184 (4): 1469–74. doi:10.1016/j.juro.2010.06.044. PMID 20727541.
- Warren T. Snodgrass (2013-05-13). Pediatric Urology: Evidence for Optimal Patient Management. Springer Science & Business Media. pp. 129–. ISBN 978-1-4614-6910-0.
- Suoub M, Dave S, El-Hout Y, Braga LH, Farhat WA (October 2008). "Distal hypospadias repair with or without foreskin reconstruction: A single-surgeon experience". J Pediatr Urol. 4 (5): 377–80. doi:10.1016/j.jpurol.2008.01.215. PMID 18790424.
- Snodgrass W, Dajusta D, Villanueva C, Bush N (August 2013). "Foreskin reconstruction does not increase urethroplasty or skin complications after distal TIP hypospadias repair". J Pediatr Urol. 9 (4): 401–6. doi:10.1016/j.jpurol.2012.06.008. PMID 22854388.
- Gatti, John M. "Epidemiology". Medscape Reference. Retrieved 22 January 2013.
- Austin, Paul F.; Siow, Yong; Fallat, Mary E.; Cain, Mark P.; Rink, Richard C.; Casale, Anthony J. (2002). "The Relationship Between Müllerian Inhibiting Substance and Androgens in Boys with Hypospadias". The Journal of Urology. 168 (4): 1784–1788. doi:10.1016/S0022-5347(05)64413-8. PMID 12352359.
- Patel, Rakesh P.; Shukla, Aseem R.; Snyder, Howard M. (2004). "The Island Tube and Island Onlay Hypospadias Repairs Offer Excellent Long-Term Outcomes: A 14-Year Followup". The Journal of Urology. 172 (4): 1717–1719. doi:10.1097/01.ju.0000138903.20136.22. PMID 15371798.
- Retik, Alan B; Atala, Anthony (2002). "Complications of hypospadias repair". Urologic Clinics of North America. 29 (2): 329–39. doi:10.1016/S0094-0143(02)00026-5. PMID 12371224.
- Shukla, Aseem R; Patel, Rakesh P; Canning, Douglas A (2004). "Hypospadias". Urologic Clinics of North America. 31 (3): 445–60, viii. doi:10.1016/j.ucl.2004.04.020. PMID 15313054.
- International Trends in Rates of Hypospadias and Cryptorchidism
- Uretheral graft technique (Camillo Il Grande)
- "Special issue on hypospadias". Indian Journal of Urology. 24 (2). 2008.
|Wikimedia Commons has media related to Hypospadias.|