Cystic malformation of the aqueduct and of the fourth ventricle.
D001927:Brain Diseases / Q000151:congenital* / Q000000981:diagnostic imaging; D002535:Cerebral Aqueduct / Q000002:abnormalities*; D002552:Cerebral Ventricles / Q000002:abnormalities*; D002648:Child; D003560:Cysts / Q000151:congenital* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000150:complications; D011859:Radiography