title: Normal pressure hydrocephalus due to membranous obstruction of the sylvian aqueduct.
abstract: In a patient presenting with the clinical features of normal pressure hydrocephalus, a membranous obstruction of the aqueduct of Sylvius was demonstrated by combined air encephalography and contrast ventriculography. Ventriculoatrial shunting resulted in clinical improvement without significant change in ventricular size.
mesh_terms: D000368:Aged; D001927:Brain Diseases / Q000150:complications / Q000473:pathology; D002535:Cerebral Aqueduct / Q000473:pathology; D014695:Cerebral Ventriculography; D003251:Constriction, Pathologic; D006801:Humans; D006849:Hydrocephalus / Q000209:etiology*; D006850:Hydrocephalus, Normal Pressure / Q000000981:diagnostic imaging / Q000209:etiology*; D008297:Male; D011011:Pneumoencephalography