Treatment of ruptured fusiform aneurysm in the posterior cerebral artery with posterior cerebral artery-superior cerebellar artery anastomosis combined with parent artery occlusion: case report

Abstract Background Surgical management of a fusiform aneurysm in the PCA sometimes requires occlusion of the parent artery. In such cases, reconstruction of the PCA may prevent the development of postoperative visual field defects. Case Description A 30-year-old woman with a fusiform aneurysm in the P2 of the left PCA presented with subarachnoid hemorrhage. The left superficial temporal artery and OA were hypoplastic. Left temporal craniotomy revealed that the lateromesencephalic ambient segment of the SCA and the posterior half portion of the P2 segment ran parallel and near each other, and that the calibers of both arteries were relatively consistent. Thus, the 2 arteries were anastomosed in a side-to-side fashion, and the anterior half of the left P2 segment was occluded by clipping proximal and distal to the aneurysm that was located at the left P2 segment just distal to the junction to the posterior communicating artery. The patient had an uneventful postoperative course, and postoperative cerebral angiography demonstrated resolution of the aneurysm, with perfusion of the left PCA from the left SCA via the anastomosis. Conclusions Posterior cerebral artery–superior cerebellar artery anastomosis is a useful method of achieving PCA reconstruction in the context of a PCA aneurysm requiring occlusion of the parent vessel and when superficial temporal artery or OA-PCA anastomosis cannot be performed.