title: Intra-arachnoid cyst of the posterior fossa causing obstructive hydrocephalus.
mesh_terms: D001099:Arachnoid; D001927:Brain Diseases / Q000150:complications*; D014695:Cerebral Ventriculography; D002557:Cerebrospinal Fluid Shunts; D003560:Cysts / Q000150:complications*; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000209:etiology* / Q000601:surgery; D007223:Infant; D011011:Pneumoencephalography