title: A ruptured aneurysm located at a collateral artery that extended from the proximal A2 segment to the M1 segment, associated with an anomalous branch of the anterior choroidal artery and middle cerebral artery hypoplasia: case report.
abstract: We here describe the first case of a ruptured aneurysm located at a collateral artery that extended from the proximal A2 segment to the M1 segment, which was associated with an anomalous branch of the anterior choroidal artery and middle cerebral artery (MCA) hypoplasia. The aneurysm was revealed by angiograms and intraoperative findings. No previous accounts have been published of such an extremely rare vessel anomaly. In practice, this case highlights the urgent need to preoperatively recognize such vascular anomalies, as well as to better understand the collateral blood supply in cerebral ischemia associated with these MCA anomalies. Such knowledge will be helpful for planning optimal surgical procedures.
authors.affiliation: Department of Neurosurgery, National Defense Medical College.
authors.forename: Naoki
authors.initials: N
authors.lastname: Otani
authors.forename: Kojiro
authors.initials: K
authors.lastname: Wada
authors.forename: Fumihiro
authors.initials: F
authors.lastname: Sakakibara
authors.forename: Satoru
authors.initials: S
authors.lastname: Takeuchi
authors.forename: Kimihiro
authors.initials: K
authors.lastname: Nagatani
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Hideo
authors.initials: H
authors.lastname: Osada
authors.forename: Takamoto
authors.initials: T
authors.lastname: Suzuki
authors.forename: Kentaro
authors.initials: K
authors.lastname: Mori
mesh_terms: D000368:Aged; D017541:Aneurysm, False / Q000000981:diagnostic imaging* / Q000601:surgery; D017542:Aneurysm, Ruptured / Q000000981:diagnostic imaging* / Q000601:surgery; D002831:Choroid Plexus / Q000098:blood supply*; D003097:Collateral Circulation / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D020244:Infarction, Middle Cerebral Artery / Q000000981:diagnostic imaging*; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000601:surgery; D002538:Intracranial Arteriovenous Malformations / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D020768:Middle Cerebral Artery / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed