Significance of a small bulge on the basilar artery in patients with perimesencephalic nonaneurysmal subarachnoid hemorrhage. Report of two cases.
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.
Matsumaru
Yuji
Y
Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, Japan.
Yanaka
Kiyoyuki
K
Muroi
Ai
A
Sato
Hiroaki
H
Kamezaki
Takao
T
Nose
Tadao
T
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