title: Thunderclap headache and unruptured cerebral aneurysm.
mesh_terms: D000208:Acute Disease; D000328:Adult; D002533:Cerebral Angiography; D003937:Diagnosis, Differential; D005260:Female; D006261:Headache / Q000209:etiology*; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications*; D008297:Male; D010865:Pilot Projects; D011446:Prospective Studies; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis