title: De novo vertebral artery-posterior inferior cerebellar artery aneurysm: a case report.
abstract: BACKGROUND
  There have been few reports of de novo aneurysms in the posterior circulation since most de novo aneurysms occur in the anterior circulation.
  
  
  METHODS
  At the age of 46 years, the patient suffered a subarachnoid hemorrhage due to a ruptured right middle cerebral artery aneurysm, which was subsequently clipped. Eight years later, the patient experienced another subarachnoid hemorrhage of the posterior fossa predominance. A cerebral angiogram demonstrated a right vertebral artery-posterior inferior cerebellar artery (VA-PICA) aneurysm that had not been noted on the previous study.
  
  
  CONCLUSIONS
  The first case of a subarachnoid hemorrhage from a right de novo VA-PICA aneurysm is presented. The characteristics of de novo aneurysms in the posterior circulation are discussed.
authors.affiliation: Department of Neurosurgery, Semboku National Hospital, Osaka, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kanemoto
authors.forename: M
authors.initials: M
authors.lastname: Hisanaga
authors.forename: H
authors.initials: H
authors.lastname: Bessho
mesh_terms: D002531:Cerebellum / Q000098:blood supply*; D002533:Cerebral Angiography; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging / Q000209:etiology; D014057:Tomography, X-Ray Computed; D014711:Vertebral Artery / Q000473:pathology*