バイパス併用による脳動脈りゅう手術におけるＢａｌｌｏｏｎ ｏｃｃｌｕｓｉｏｎ ｔｅｓｔ特異的なＥＣ‐ＩＣ側副血行路

Abstract

In patients with unclippable internal carotid (IC) aneurysms, parent artery occlusion combined with bypass surgery is often indicated. To establish a strategy of such surgery, the preoperative IC occlusion test plays a major role. Recently we experienced 3 cases with EC-IC collateral pathway around the petrous portion of IC, which was evident only on common carotid angiography during balloon occlusion test of IC origin at the neck. Although the significance of this type of collateral pathway is yet to be known, it may be necessary to pay attention to this possible collateral flow into the aneurysm.