• Toshihiro Ishibashi, Yuichi Murayama, Mitsuyoshi Urashima, Takayuki Saguchi, Masaki Ebara, Hideki Arakawa, Koreaki Irie, Hiroyuki Takao, and Toshiaki Abe.
• Stroke. 2009 Jan 1; 40 (1): 313-6.

UnlabelledBackgrounds and Purpose- The authors evaluated the incidence of rupture of unruptured intracranial saccular aneurysm during observation.MethodsBetween January 2003 and December 2006, a total of 419 patients with 529 unruptured intracranial saccular aneurysms were observed without treatment. The mean follow-up duration was 905.3 days. Aneurysm size was measured by 3-dimensional CT angiography. Clinical and 3-dimensional CT angiography follow-up were obtained every 6 months.ResultsNineteen aneurysms ruptured during observation resulting in a 1.4% rupture rate per year. A history of subarachnoid hemorrhage (hazard ratio, 7.3; 95% CI, 2.5 to 21.2), posterior circulation aneurysm (hazard ratio, 2.9; 95% CI, 1.1 to 8), and large size were significant independent predictors for aneurysm rupture.ConclusionsSize, history of subarachnoid hemorrhage, and posterior circulation aneurysms were significant risk factors for prediction of rupture of unruptured intracranial saccular aneurysms.

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