title: Thunderclap headache, reversible cerebral arterial vasoconstriction, and unruptured aneurysms.
authors.forename: A B
authors.initials: AB
authors.lastname: Singhal
mesh_terms: D002536:Cerebral Arteries / Q000503:physiopathology*; D002560:Cerebrovascular Circulation; D006261:Headache / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications* / Q000503:physiopathology; D014661:Vasoconstriction