Department of Emergency Medicine

UMEM Educational Pearls

Category: Neurology

Title: Cerebral Aneurysms: Size Matters

Keywords: cerebral aneurysm, SAH (PubMed Search)

Posted: 8/20/2008 by Aisha Liferidge, MD (Updated: 4/27/2024)
Click here to contact Aisha Liferidge, MD

  • Most studies suggest that the risk of aneurysm rupture significantly increases after the size of 7 mm.
  • The risk of rupture is greater for posterior circulation aneurysms.
  • Five-year risk of aneurysmal rupture based on size (for anterior and posterior circulation aneurysms, respectively):

    ---  7 to 12 mm --> 2.6 and 14.5%              

             ---- 13 to 24 mm --> 14.5 and 18.4%


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