title: Clinical characteristics of subarachnoid hemorrhage with or without headache.
abstract: OBJECTIVE
  Some patients report the absence of a typical headache at the onset of subarachnoid hemorrhage (SAH). We investigated the clinical backgrounds and characteristics of patients with SAH without headache and compared the findings with those of patients with SAH and headache.
  
  
  METHODS
  We examined 224 patients retrospectively who underwent intracranial aneurysmal clipping. Patient's characteristics, Fisher's computed tomography grade, situation at onset, site of ruptured aneurysm, and symptoms were compared. Subjects were categorized into two groups: headache group and nonheadache group.
  
  
  RESULTS
  Eighteen patients (8.0%) did not present with headache. There were no significant differences in terms of age, sex, Fisher's computed tomography grade, onset time, or site of ruptured aneurysm.
  
  
  CONCLUSIONS
  The patients without headache have no specific clinical characteristics over patients with common SAH.
authors.affiliation: Department of Neurology, Stroke Center, Saiseikai Kumamoto Hospital, Kumamoto City, Japan. naganuma@hsp.ncvc.go.jp
authors.forename: Masaki
authors.initials: M
authors.lastname: Naganuma
authors.forename: Shodo
authors.initials: S
authors.lastname: Fujioka
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Inatomi
authors.forename: Toshiro
authors.initials: T
authors.lastname: Yonehara
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Hashimoto
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Hirano
authors.forename: Makoto
authors.initials: M
authors.lastname: Uchino
mesh_terms: D017677:Age Distribution; D000368:Aged; D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D015897:Comorbidity / Q000639:trends; D018450:Disease Progression; D005260:Female; D006212:Hallucinations / Q000453:epidemiology; D006261:Headache / Q000453:epidemiology* / Q000503:physiopathology; D006801:Humans; D002532:Intracranial Aneurysm / Q000453:epidemiology* / Q000503:physiopathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D018908:Muscle Weakness / Q000453:epidemiology; D019635:Neurosurgical Procedures; D012189:Retrospective Studies; D017678:Sex Distribution; D013345:Subarachnoid Hemorrhage / Q000453:epidemiology* / Q000503:physiopathology / Q000601:surgery; D013525:Surgical Instruments; D014057:Tomography, X-Ray Computed; D014474:Unconsciousness / Q000453:epidemiology