Cerebral revascularization offers an important adjunct to parent-vessel lig
ation in the treatment of large and otherwise inaccessible intracranial ane
urysms. Good or excellent outcomes can be expected in approximately 80% of
patients. Poor outcomes and ischemic complications were highest in posterio
r circulation lesions. Cranial neuropathies from mass effect associated wit
h giant aneurysms of the cavernous and intradural internal carotid artery w
ill improve and be cured in the majority of patients treated with universal
revascularization approach. In combination with open parent vessel ligatio
n or endovascular occlusion, durable protection from subarachnoid hemorrhag
e can be achieved.