Colloid cysts represent approximately 1% of all intracranial neoplasms [6, 12, 54, 173]. The preferential localization of these lesions to the anterior part of the third ventricle explains why these lesions appear primarily with obstructive biventricular hydrocephalus, the obstruction sitting on the level of the foramina of Monro. The natural history of these histologically benign tumors has not been clearly elucidated. Some colloid cysts are asymptomatic and can be followed for several years without any radiological changes [22, 30]. In contrast to this, some cysts have been reported to induce precipitous neurological decline [22,25,97], and they can also be a possible cause of sudden death due to acute obstruction of cerebrospinal fluid (CSF) pathways [3,9,20,99,139,144].