Operative Findings of Unruptured Cerebral Aneurysms That Grew During Follow-up Periods

We examined the operative findings of cerebral aneurysms that grew during follow-ups over the past 5 years. We defined aneurysmal growth as form change such as the bleb formation or more than 2-mm growth compared with past findings. In operation, we confirmed a very thin wall of cerebral aneurysm correspond to aneursymal growth during follow-up. Rupture rates appear to be high in aneurysms caused by a change such as the above. Clipping can prevent aneurysmal rupture in these cases.