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Colloid cysts

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Colloid cysts are benign growths which usually present in adult life. They are thought to arise from the ependymal cells of the anterior portion of the third ventricle and become symptomatic when of sufficient size to occlude the ventricle and cause obstructive hydrocephalus.

Presentation is typically with a history of intermittent headaches, loss of consciousness and sudden weakness of the legs. CT shows the cysts as a small circular mass of increased density lying level with the foramen of Munro and associated with bilateral ventricular dilatation. Sudden death can occur, usually as a result of acute hydrocephalus.

Treatment is either drainage or excision through the dilated right ventricle.

Following treatment, the prognosis is good.


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