title: [The clinical analysis of nonaneurysmal subarachnoid hemorrhage].
abstract: OBJECTIVE
  To enhance recognition of the clinical and radiological features of nonaneurysmal subarachnoid hemorrhage (SAH) and its prognosis, and to provide guidance for the diagnosis and treatment in clinical practice.
  
  
  METHODS
  Patients with spontaneous SAH, whose initial 3-dimensional digital subtraction angiography (DSA) were negative, received a second DSA after 2 to 3 weeks. Nonaneurysmal was diagnosed as SAH when both DSA were negative. All subjects were divided into 2 subgroups, perimesencephalic nonaneurysmal subarachnoid hemorrhage (PNSAH) group and nonperimesencephalic nonaneurysmal subarachnoid hemorrhage (n-PNSAH) group.
  
  
  RESULTS
  Among 49 patients with nonaneurysmal SAH, 24 patients were PNSAH and 25 patients were n-PNSAH. Two patients died and 47 patients recovered and discharged with an average follow-up of 26 months.
  
  
  CONCLUSIONS
  The clinical course and prognosis of patients with PNSAH were good, better than that of patients with n-PNSAH.
authors.affiliation: Department of Neurology, Affiliated Hospital of Nantong University, Nantong 226001, China.
authors.forename: Chao-pin
authors.initials: CP
authors.lastname: DU
authors.forename: Kai-fu
authors.initials: KF
authors.lastname: Ke
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D005260:Female; D006801:Humans; D008297:Male; D008636:Mesencephalon; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging* / Q000628:therapy*; D055815:Young Adult