Abstract
We experienced 5 cases of nonbranching site aneurysms arising from the internal carotid artery system in the past 5 years. Two cases were successfully treated with neck clipping and 2 cases were treated with trapping. Wrapping by gauze and fibrin glue was used in 1 unruptured case. The outcome was good in all cases (mRS 0-2). However, non-branching site aneurysms have fragile walls, the neck is not clearly defined and postoperative rebleeding can easily occur. We believe the sacrifice of a normal parent artery is necessary to prevent re-bleeding. For this reason, we believe interception of the parent artery should always be considered to prevent postoperative rebleeding. When parent artery interception is of concern regarding postoperative ischemic events, a high-flow EC-IC bypass may be needed. On the other hand, the issue of separation of the neck is possible at all sides and the possibility of clipping strangling part of the parent artery also exists.
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