title: Significance of a small bulge on the basilar artery in patients with perimesencephalic nonaneurysmal subarachnoid hemorrhage. Report of two cases.
abstract: Perimesencephalic nonaneurysmal subarachnoid hemorrhage (SAH) is a distinct type of hemorrhage with a characteristic bleeding pattern and an excellent clinical outcome. The cause of this benign form of SAH remains unknown. The authors report on two cases of perimesencephalic nonaneurysmal SAH in which a small bulge on the basilar artery (BA) was demonstrated on three-dimensional rotational angiography studies. Based on data from these cases, one may infer that the lesion on the BA is responsible for the SAH. The possible pathogenesis is discussed.
authors.affiliation: Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Matsumaru
authors.forename: Kiyoyuki
authors.initials: K
authors.lastname: Yanaka
authors.forename: Ai
authors.initials: A
authors.lastname: Muroi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Sato
authors.forename: Takao
authors.initials: T
authors.lastname: Kamezaki
authors.forename: Tadao
authors.initials: T
authors.lastname: Nose
mesh_terms: D001488:Basilar Artery / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008636:Mesencephalon / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008875:Middle Aged; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging* / Q000209:etiology* / Q000503:physiopathology; D014057:Tomography, X-Ray Computed