Colloid cysts of the brain

Most commonly involves the third ventricle.

The most common neoplasm of the third ventricle.

Can result in the blockage of both foramen of Monro causing dilatation of both lateral ventricles.

May be associated with hydrocephalus leading to headache, nausea, vomiting, and lethargy.

Chronic hydrocephalus may have a indolent onset consisting of headache, confusion, ataxia, impaired memory, and urinary incontinence.

Colloid cysts on CT and MRI examinations are usually diagnostic with being well circumscribed and hyperdense on CT.

Most commonly located near the Foramen of Monro posterior to the fornices in the anterosuperior third ventricle.

Most commonly found as an incidental finding and are asymptomatic at that time.

Some patients may present with positional headaches, that are due to a cyst which is able to swing from its attachments on the roof of the third ventricle into the fora,en of Monro and can acutely obstruct the CSF flow in the lateral ventricles.

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