Extracranial-intracranial arterial bypass surgery for occlusive carotid artery disease.

The EC/IC Bypass Study Group found no benefit of extracranial to intracranial (EC/IC) bypass surgery over medical therapy in patients with symptomatic carotid artery occlusion (sCAO). However, the study was criticised for many reasons and the real effect of this treatment is still not known conclusively.