Third Ventricle Colloid Cyst as a Cause of Sudden Drop Attacks of a 13-Year-Old Boy

Colloid cysts are mucous-filled masses with an outer fibrous layer. These cysts are rare developmental malformation and not a true neoplasm. They usually found incidentally and are asymptomatic; but in some cases may associate with rapid neurologic deterioration, herniation, and sudden death. Recognition of this rare but important diagnosis may result in decreasing mortality. In this report, we presented a 13-year-old boy with complaint of two times drop attack and final diagnosis of colloid cyst in the third brain ventricle.