title: Classification of non-aneurysmal subarachnoid haemorrhage: CT correlation to the clinical outcome.
abstract: OBJECTIVE
  To propose a new computed tomography (CT)-based classification system for non-aneurysmal subarachnoid haemorrhage (SAH), which predicts patients' discharge clinical outcome and helps to prioritize appropriate patient management.
  
  
  METHODS
  A 5-year, retrospective, two-centre study was carried out involving 1486 patients presenting with SAH. One hundred and ninety patients with non-aneurysmal SAH were included in the study. Initial cranial CT findings at admission were correlated with the patients' discharge outcomes measured using the Modified Rankin Scale (MRS). A CT-based classification system (type 1-4) was devised based on the topography of the initial haemorrhage pattern.
  
  
  RESULTS
  Seventy-five percent of the patients had type 1 haemorrhage and all these patients had a good clinical outcome with a discharge MRS of <or=1. Eight percent of the patients presented with type 2 haemorrhage, 62% of which were discharged with MRS of <or=1 and 12% of patients had MRS 3 or 4. Type 3 haemorrhage was found in 10%, of which 16% had good clinical outcome, but 53% had moderate to severe disability (MRS 3 and 4) and 5% were discharged with severe disability (MRS 5). Six percent of patients presented with type 4 haemorrhage of which 42% of the patients had moderate to severe disability (MRS 3 and 4), 42% had severe disability and one-sixth of the patients died. Highly significant differences were found between type 1(1a and 1b) and type 2 (p=0.003); type 2 and type 3 (p=0.002); type 3 and type 4 (p=0.001).
  
  
  CONCLUSIONS
  Haemorrhages of the type 1 category are usually benign and do not warrant an extensive battery of clinical and radiological investigations. Type 2 haemorrhages have a varying prognosis and need to be investigated and managed along similar lines as that of an aneurysmal haemorrhage with emphasis towards radiological investigation. Type 3 and type 4 haemorrhages need to be extensively investigated to find an underlying cause.
authors.affiliation: Department of Neuroradiology, University Hospital of North Staffordshire, North Staffordshire Royal Infirmary, Stoke-on-Trent, Staffordshire, UK. sanjeevnayak@hotmail.com
authors.forename: S
authors.initials: S
authors.lastname: Nayak
authors.forename: A B
authors.initials: AB
authors.lastname: Kunz
authors.forename: K
authors.initials: K
authors.lastname: Kieslinger
authors.forename: G
authors.initials: G
authors.lastname: Ladurner
authors.forename: M
authors.initials: M
authors.lastname: Killer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001317:Austria / Q000453:epidemiology; D002533:Cerebral Angiography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010351:Patient Discharge / Q000706:statistics & numerical data*; D011379:Prognosis; D012189:Retrospective Studies; D013345:Subarachnoid Hemorrhage / Q000145:classification / Q000000981:diagnostic imaging* / Q000453:epidemiology; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D006113:United Kingdom / Q000453:epidemiology; D055815:Young Adult