Colloid cyst of the third ventricle.
D000293:Adolescent; D002544:Cerebral Infarction / Q000473:pathology*; D002552:Cerebral Ventricles / Q000473:pathology*; D003560:Cysts / Q000473:pathology*; D003645:Death, Sudden / Q000473:pathology; D006801:Humans; D006849:Hydrocephalus / Q000473:pathology*; D008297:Male