title: Subarachnoid hemorrhage caused by rupture of a distal anterior inferior cerebellar artery aneurysm--three case reports.
abstract: Three female patients, two under 35 years old, presented with ruptured aneurysms of the distal anterior inferior cerebellar artery (AICA) manifesting as subarachnoid hemorrhage. The first patient had a ruptured saccular aneurysm of the meatal loop of AICA, which was treated by direct neck clipping. The second patient had a ruptured aneurysmal lesion that arose from a microvascular anomaly of the dorsolateral portion of the AICA, which was successfully treated by trapping. The third patient was dead on arrival, and autopsy revealed a ruptured saccular aneurysm in the meatal loop of the AICA. The mechanism of development of distal AICA aneurysm remains unclear, and some cases indicate a complicated causal relationship between the aneurysms and vascular anomalies. Neurosurgeons need to carefully evaluate the vascular structure around the aneurysms by preoperative angiography in each case, and select the most appropriate strategy.
authors.affiliation: Department of Neurosurgery, Stroke Center, Sendai Medical Center, Miyagi. satsushi2002@yahoo.co.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Saito
authors.forename: Akiko
authors.initials: A
authors.lastname: Nishino
authors.forename: Ichiro
authors.initials: I
authors.lastname: Suzuki
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Suzuki
authors.forename: Akihiro
authors.initials: A
authors.lastname: Utsunomiya
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Suzuki
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Uenohara
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Sakurai
mesh_terms: D000328:Adult; D017542:Aneurysm, Ruptured / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D002531:Cerebellum / Q000098:blood supply / Q000000981:diagnostic imaging; D002533:Cerebral Angiography; D003399:Craniotomy; D017809:Fatal Outcome; D005260:Female; D006408:Hematoma, Subdural / Q000000981:diagnostic imaging / Q000209:etiology; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D008875:Middle Aged; D012422:Rupture, Spontaneous; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging / Q000209:etiology*; D055815:Young Adult