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- 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%