title: Posterior inferior cerebellar aneurysm in the fourth ventricle.
abstract: The authors report a very rare case of ruptured aneurysm in the fourth ventricle. This aneurysm arose at the elongated supratonsillar segment of the right posterior inferior cerebellar artery and successful clipping was carried out after splitting the lower vermis.
mesh_terms: D002531:Cerebellum / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000601:surgery; D002533:Cerebral Angiography; D002552:Cerebral Ventricles / Q000098:blood supply* / Q000601:surgery; D014695:Cerebral Ventriculography; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D008875:Middle Aged