Aneurysm   Intracranial aneurysm   Intraoperative complications   Ruptured aneurysm   Intracranial aneurysm surgery   Intraoperative complications epidemiology   Aneurysm epidemiology   Human   Male   Adult   Middle aged   Aged   Treatment outcome   Adolescent   Retrospective studies   Infant   80 & over aged   Subarachnoid hemorrhage   Incidence   Intracranial aneurysm complications   Subarachnoid hemorrhage etiology   Intraoperative complications etiology   Aneurysm etiology   Subarachnoid hemorrhage epidemiology