Cerebral vasospasm and unruptured aneurysm in thunderclap headache.
D000328:Adult; D006261:Headache / Q000209:etiology*; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications* / Q000000981:diagnostic imaging; D002546:Ischemic Attack, Transient / Q000150:complications* / Q000000981:diagnostic imaging; D011859:Radiography