• Sophie M Peeters, Geoffrey P Colby, Wi Jin Kim, Whi Inh Bae, Hiro Sparks, Kara Reitz, Satoshi Tateshima, Reza Jahan, Viktor Szeder, May Nour, Gary R Duckwiler, Fernando Vinuela, Neil A Martin, and Anthony C Wang.
• Department of Neurosurgery, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA.
• World Neurosurg. 2023 Dec 1; 180: e494e505e494-e505.

ObjectiveTo discuss the treatment of intracranial fusiform and giant internal carotid artery (ICA) aneurysms via revascularization based on our institutional experience.MethodsAn institutional review board-approved retrospective analysis was performed of patients with unruptured fusiform and giant intracranial ICA aneurysms treated from November 1991 to May 2020. All patients were evaluated for extracranial-intracranial (EC-IC) bypass and ICA occlusion.ResultsThirty-eight patients were identified. Initially, patients failing preoperative balloon test occlusion were treated with superficial temporal artery (STA)-middle cerebral artery (MCA) bypass and concurrent proximal ICA ligation. We then treated them with STA-MCA bypass, followed by staged balloon test occlusion, and, if they passed, endovascular ICA coil occlusion. We treat all surgical medically uncomplicated patients with double-barrel STA-MCA bypass and concurrent proximal ICA ligation. The mean length of follow-up was 99 months. Symptom stability or improvement was noted in 85% of patients. Bypass graft patency was 92.1%, and all surviving patients had patent bypasses at their last angiogram. Aneurysm occlusion was complete in 90.9% of patients completing proximal ICA ligation. Three patients experienced ischemic complications and 4 patients experienced hemorrhagic complications.ConclusionsNot all fusiform intracranial ICA aneurysms require intervention, except when life-threatening rupture risk is high or symptomatic management is necessary to preserve function and quality of life. EC-IC bypass can augment the safety of proximal ICA occlusion. The rate of complete aneurysm occlusion with this treatment is 90.9%, and long-term bypass graft-related complications are rare. Perioperative stroke is a major risk, and continued evolution of treatment is required.Copyright © 2023 The Author(s). Published by Elsevier Inc. All rights reserved.

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