Subarachnoid Hemorrhage due to Rupture of Infundibular Dilation of a Circumflex Branch of the Posterior Cerebral Artery

The authors describe a rare case in which an infundibular dilation at the origin of a circumflex branch of the P1 segment of the posterior cerebral artery caused subarachnoid hemorrhage. Wrapping was performed by a subtemporal approach in the delayed stage. At the time of surgery, the rupture point was found in the infundibular dilation.