Benign perimesencephalic hemorrhage occurring after previous aneurysmal subarachnoid hemorrhage: a case report.

Introduction Both aneurysmal subarachnoid hemorrhage and benign perimesencephalic hemorrhage are well-described causes of spontaneous subarachnoid hemorrhage that arise as a result of different pathologic processes. To the best of the authors' knowledge, there have been no reports of both vascular pathologies occurring in the same individual.