Abstract WMP30: Risk Analysis Of Growth And Rupture In Unruptured Intreacranial Aneurysms : Single Institutional Cohort Study

Introduction: Risk of growth and rupture in unruptured intracranial saccular aneurysm (UIA) are still unclear. Hypothesis: Gowth and risk of UIA may be correlated and they were evaluated our single center large cohort. Methods: Between January 2003 and March 2011, a total of 2122 patients with 2756 UIA were referred to our institution. 1403 patients with 2037 UIAs were assigned for conservative management. The mean follow up duration was 6201 aneurysm-years. Bi-annual three-dimensional computed tomography angiography (3D CTA) was performed and aneurysm growth was evaluated using 3D workstation. The aneurysm growth was defined as size increase more than 1mm. Results: During observation, 14.6% aneurysms increased their size. Female and male growth rate were 16% and 11% respectively. 130 patients stopped observation and therapeutic intervention was performed due to increase their size or anxiety. During observation 50 UIAs ruptured resulting in a 0.8% rupture rate per year. Aneurysm growth, IC-pcom aneurysms, posterior circulation, female, and SAH associated multiple aneurysms were risk factor for aneurysm rupture. Growing aneurysm was 10 times higher relative risk of rupture compare to stable aneurysm. No aneurysm demonstrated reduction of their size after rupture. Conclusions: Risk of Aneurysm growth and rupture may be correlated. Risk of rupture of UIAs was similar that was reported before but even small aneurysms can be rupture during observation. Growing UIAs should be considered to treat as soon as possible even in small size.