title: Subarachnoid hemorrhage caused by ruptured dissecting aneurysm arising from the extracranial distal posterior inferior cerebellar artery--case report.
abstract: A 50-year-old man presented with a dissecting aneurysm arising from the extracranial portion of the right posterior inferior cerebellar artery (PICA) causing subarachnoid hemorrhage (SAH) and manifesting as sudden onset of disturbed consciousness. Computed tomography showed SAH with ventricular reflux predominantly in the posterior fossa. Angiography revealed a fusiform aneurysm of the right PICA originating extracranially from the right vertebral artery. The aneurysm was isolated and excised. Histological examination showed dissection of the aneurysm wall. Dissecting aneurysm arising from the extracranial portion of the PICA is extremely rare.
authors.affiliation: Department of Neurosurgery, Ishioka Cardiology and Neurosurgery Hospital, Omitama, Ibaraki, Japan.
authors.forename: Homare
authors.initials: H
authors.lastname: Nakamura
authors.forename: Toshihide
authors.initials: T
authors.lastname: Tanaka
authors.forename: Takami
authors.initials: T
authors.lastname: Hiyama
authors.forename: Shinji
authors.initials: S
authors.lastname: Okubo
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kudo
authors.forename: Hiroo
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Mieko
authors.initials: M
authors.lastname: Odanaka
mesh_terms: D002531:Cerebellum / Q000098:blood supply*; D002533:Cerebral Angiography; D003244:Consciousness Disorders / Q000209:etiology; D003287:Contrast Media; D003388:Cranial Fossa, Posterior / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D020546:Fourth Ventricle / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000295:instrumentation / Q000379:methods; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging / Q000473:pathology*; D013525:Surgical Instruments; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014656:Vascular Surgical Procedures / Q000295:instrumentation / Q000379:methods; D014711:Vertebral Artery / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000473:pathology*; D020217:Vertebral Artery Dissection / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology*
chemical_list: D003287:Contrast Media