title: Risk of rupture of unruptured intracranial aneurysms in relation to patient and aneurysm characteristics: an updated meta-analysis.
abstract: OBJECTIVE
  We updated our previous review from 1996 on the risk of rupture of unruptured intracranial aneurysms, aiming to include the newly published articles.
  
  
  METHODS
  We reviewed all studies from our former meta-analysis and performed a Medline search for new studies published after 1996. We calculated overall risks of rupture for studies with a mean follow-up time of <5, 5 to 10, and >10 years. Relative risks (RR) were calculated by comparing the risk of rupture in patients with and without potential risk factors. We aimed to perform multivariable analyses of the different risk factors with meta-regression analysis.
  
  
  RESULTS
  We included 19 studies (10 new) with 4705 patients and 6556 unruptured aneurysms (follow-up 26 122 patient-years). The overall rupture risks were 1.2% (follow-up <5 years), 0.6% (follow-up 5 to 10 years), and 1.3% (follow-up >10 years). In the univariable analysis, statistically significant risk factors for rupture were age >60 years (RR 2.0; 95% confidence interval [CI], 1.1 to 3.7), female gender (RR 1.6; 95% CI, 1.1 to 2.4), Japanese or Finnish descent (RR 3.4; 95% CI, 2.6 to 4.4), size >5 mm (RR 2.3; 95% CI, 1.0 to 5.2), posterior circulation aneurysm (RR 2.5; 95% CI, 1.6 to 4.1), and symptomatic aneurysm (RR 4.4; 95% CI, 2.8 to 6.8). Meta-regression analysis yielded implausible results.
  
  
  CONCLUSIONS
  Age, gender, population, size, site, and type of aneurysm should be considered in the decision whether to treat an unruptured aneurysm. Pooled multivariable analyses of individual data are needed to identify independent risk factors and to provide more reliable risk estimates for individual patients.
authors.affiliation: Department of Neurology, University Medical Center Utrecht, Utrecht, The Netherlands. m.wermer@neuro.azu.nl
authors.forename: Marieke J H
authors.initials: MJ
authors.lastname: Wermer
authors.forename: Irene C
authors.initials: IC
authors.lastname: van der Schaaf
authors.forename: Ale
authors.initials: A
authors.lastname: Algra
authors.forename: Gabriël J E
authors.initials: GJ
authors.lastname: Rinkel
mesh_terms: D017677:Age Distribution; D000368:Aged; D017542:Aneurysm, Ruptured / Q000453:epidemiology* / Q000208:ethnology / Q000503:physiopathology; D003661:Decision Support Techniques; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000453:epidemiology* / Q000208:ethnology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D018570:Risk Assessment; D012307:Risk Factors; D017678:Sex Distribution; D013345:Subarachnoid Hemorrhage / Q000453:epidemiology* / Q000208:ethnology / Q000503:physiopathology