title: De novo basilar head aneurysms--two case reports.
abstract: We describe two rare cases of de novo basilar head aneurysms. The first patient presented with a ruptured basilar tip aneurysm, which developed de novo 5 years after the clipping of a left middle cerebral artery aneurysm. The second patient presented with a right basilar artery-superior cerebellar artery aneurysm, which developed de novo 3 years after the clipping of a right A(1) aneurysm. The formation of de novo aneurysm in the posterior circulation has significant implications for screening. Patients must be carefully examined not only at the sites of the initial aneurysm, but also at separate sites, including the posterior circulation, to evaluate the possibility of de novo appearance of another aneurysm.
authors.affiliation: Department of Neurosurgery, Nagasaki Prefecture Shimabara Hospital, Shimabara, Nagasaki, Japan. i-kwhr@umin.ac.jp
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kawahara
authors.forename: Morito
authors.initials: M
authors.lastname: Nakamoto
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsuo
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Tokunaga
mesh_terms: D001488:Basilar Artery / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D001921:Brain / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology; D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology* / Q000601:surgery; D008403:Mass Screening; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000295:instrumentation / Q000379:methods; D018579:Patient Selection; D012008:Recurrence; D012086:Reoperation / Q000379:methods; D012307:Risk Factors; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D013525:Surgical Instruments; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014656:Vascular Surgical Procedures / Q000295:instrumentation / Q000379:methods