title: Aneurysmal "thunderclap" headache without subarachnoid hemorrhage.
mesh_terms: D000328:Adult; D002533:Cerebral Angiography; D005260:Female; D006261:Headache / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications* / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D014057:Tomography, X-Ray Computed