Spontaneous subarachnoid hemorrhage of unknown origin: Hospital course and long-term clinical and angiographic follow-up

Abstract

2), and neurovascular imaging, which was available in 33 patients, was negative. Conclusions Hydrocephalus and delayed cerebral ischemia, while infrequent, do occur in SAH of unknown origin. Long-term neurological outcomes are generally good. A thorough evaluation to rule out an etiology of hemorrhage is necessary; however, imaging beyond 6 weeks from ictus has little utility, and rebleeding is unexpected.