CT scan of a 1 cm<unk>  A<unk>  is a non-malignant tumor in the brain. It consists of a gelatinous material contained within a membrane of epithelial tissue. 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.<unk> s represent 0.5–1.0% of intracranial tumors. Symptoms can include headache, vertigo, memory deficits, diplopia, behavioral disturbances, and in extreme cases, sudden death. Intermittency of symptoms is characteristic of this lesion. Untreated pressure caused by these<unk> s can result in brain herniation.<unk>  symptoms have been associated with four variables:<unk>  size,<unk>  imaging characteristics, ventricular size, and patient age. Their developmental origin is unclear, though they may be of endodermal origin, which would explain the mucin-producing, ciliated cell type. These<unk> s can be surgically resected, and opinion is divided about the advisability of this.
Colloid cyst
Tarlov cyst
Dentigerous cyst
Nuchal fibroma
Odontogenic cyst
Tornwaldt cyst
Paradental cyst
Choristoma