title: Arachnoid cyst of the fourth ventricle manifesting normal pressure hydrocephalus.
mesh_terms: D000368:Aged; D001099:Arachnoid; D001927:Brain Diseases / Q000000981:diagnostic imaging / Q000473:pathology; D002552:Cerebral Ventricles; D003560:Cysts / Q000000981:diagnostic imaging* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000000981:diagnostic imaging*; D006850:Hydrocephalus, Normal Pressure / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed