Acute Non-Traumatic Cortical Subarachnoid Hemorrhage

Most nontraumatic subarachnoid hemorrhages are induced by the rupture of a saccular aneurysm. Acute nontraumatic cortical subarachnoid hemorrhage at the convexity of a cerebral hemisphere is a relatively rare occurrence with various vascular or nonvascular causes. Furthermore, the clinical manifestation of acute nontraumatic cortical subarachnoid hemorrhage differs from that of aneurysmal rupture. We experienced five cases of acute nontraumatic cortical subarachnoid hemorrhage with diverse neurological symptoms. Consecutive workup revealed the various etiologies of that hemorrhage.