Colloid cyst

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Not to be confused with Choledochal cysts.
Colloid cyst
Classification and external resources
Colloid Cyst HE 40x.jpg
Histopathology of colloid cyst
eMedicine med/2906 radio/96
CT scan of a 1 cm colloid cyst

A colloid cyst is a cyst containing gelatinous material in the brain. It is almost always found just posterior to the foramen of Monro in the anterior aspect of the third ventricle, originating from the roof of the ventricle. Because of its location, it can cause obstructive hydrocephalus and increased intracranial pressure. These cysts account for approximately 1% of all intracranial tumors.

Symptoms can include headache, vertigo, memory deficits, diplopia, behavioral disturbances and in extreme cases, sudden death. The developmental origin is unclear, though they may be of endodermal origin, which would explain the mucin-producing, ciliated cell type. These cysts can be surgically resected, and opinion is divided about the advisability of this.

Colloid cyst resection[edit]

Multiple studies have been found on how to remove a colloid cyst. One was is an endoscopic removal. To remove the cyst, make a small incision. The endoscope is inserted into the brain and then moved toward the tumor in the ventricular compartment. The tumor is hit with an electrical current. The interior of the cyst is removed followed by the cyst wall. The electrical current is then used to kill the remaining pieces of the cyst. This whole process, including closing of the incision and removal of the scope is completed within 45 minutes to an hour. The patients are able to leave the hospital after 1 or 2 days.[1] A case was done with the absence of ventriculomegaly that has been contraindication in an endoscopic removal. The study found that with normal-sized ventricles are not a contraindication. They actually have comparable or less complication rates.[2] Another study experimented with a smaller retractor tube, 12 mm instead of 16–22 mm. The study found that using a 12 mm tube on a 10 mm colloid cyst. The surgery was successful in removing the cyst with a smaller retractor tube for resection while minimizing injury. The surgery had potential for improving outcomes.


  1. ^ Colloid Cyst – New York Presbyterian Hospital. Retrieved on 2013-08-15.
  2. ^ Wait, S. D.; Gazzeri, R.; Wilson, D. A.; Abla, A. A.; Nakaji, P.; Teo, C. (2013). "Endoscopic Colloid Cyst Resection in the Absence of Ventriculomegaly". Neurosurgery 73 (1 Suppl Operative): 1. doi:10.1227/NEU.0b013e3182870980. PMID 23334281.  edit

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