摘要：Three patients with extremely rare aneurysm in the superior clinoid process of internal cardotid artery were treated and the characteristics were reported including tear of aneurysm neck, thinness and tear of parent artery wall, thrombosis, and failure to clip, etc. These situations and findings on imaging were employed to evaluate the features of such aneurysms. The parent artery was irregularly calcified regionally, thickened and deformed, or even the parent artery wall was extremely thin. Such aneurysms occurred in distinct sites with a thin wall at tumor neck and body. Under microscope, the wall of tumor body was thin and carmine. The aneurysms were susceptible to being torn during isolation or clipping of tumor neck which could even cause tear of parent artery and subsequent irreparable bleeding. In 2 patients, the parent artery was stiff due to calcification and its proximal end could not be temporarily blocked. Thrombosis was found in the tumor neck leading to incomplete closure after clipping. Caution should be emphasized, and clipping failure or tear of parent artery may occur during surgery. Pre-operative angiography may present obvious features of such aneurysms, and extra-intracranial arterial anastomosis plus isolation is a favorable strategy.
关键词：Intracranial aneurysms; clinoid process; complex surgery
