Which factors increase procedural thromboembolic events in patients with unruptured paraclinoid internal carotid artery aneurysm treated by coil embolization?

We analyzed the factors which increase the frequency of procedural thromboembolic events during coil embolization of unruptured paraclinoid internal carotid artery aneurysms. Neurologically symptomatic complications did not occur in our series. Silent hyperintense lesions on postoperative DWI were frequently detected after the coiling procedure in which we needed to withdraw the unreleased coil. Patient's age, sex, aneurysm diameter, packing density, use of balloon-assisted technique, and exchanging maneuver of microcatheter during the procedure did not increase the frequency of silent thromboembolic events.