ABSTRACT
Patients with symptomatic ICA occlusion who also have a severe (70-99%) stenosis of the contralateral ICA that is asymptomatic, may be advised to undergo endarterectomy (or endovascular treatment) of this stenosis if there is evidence for collateral blood supply via the anterior communicating artery. Similarly, treatment of severely stenosed other collateral pathways such as the ipsilateral ECA or the vertebral arteries may be considered. In our experience an important stenosis in a collateral cerebropetal vessel other than the contralateral ICA is a rare finding.
