Purpose This study is to evaluate benign cerebral vasoconstriction on the ipsilateral anterior circulation immediately after carotid artery stenting (CAS) in the near-occlusion of proximal internal carotid artery (ICA).

Materials and Methods 15 patients with near occlusion were retrospectively reviewed, who were selected among all patients who conducted CAS for proximal ICA stenosis since January 2009. Immediate post-stenting angiographic images were evaluated by two neuroradiologists for the presence of vasoconstriction.

Results Among 15 patients with near-occlusion, significant vasoconstrictions in the ipsilateral anterior circulation after CAS were shown in 7 patients (71.1±5.3 years) but not in the other 8 patients. In all 7 patients, significant vasoconstrictions were shown to occur in isolated territory without anterior and/or posterior communicating collateral flows (P<0.001). However, there are no significant statistical differences in neurologic status, procedural conditions, and comorbidity between two groups.

Conclusions Benign cerebral vasoconstriction immediately after carotid artery stenting could occur in the ipsilateral anterior circulation and in the condition with near-occlusion and isolated circulation.

Disclosures D. Park: None. T. Kim: None.