Vertebral Artery Origin Treatment Via Endovascular Techniques Registry (VOTER)

Inclusion Criteria: 1. Patients between 18 and 90 years of age 2. Patient has experienced a posterior circulation ischemic event 3. Patient has angiographically confirmed bilateral vertebral artery origin disease (Hypoplasia, occlusion, or stenosis). 4. Patient has \>50% stenosis on the side being targeted for therapy Exclusion Criteria: 1. Pregnant women 2. Contrast Indication to the use of anti-platelet drugs 3. There is tandem vertebral or basilar artery stenosis 4. The serum creatinin is \>2.5 5. Baseline modified Rankin score is \>3 6. \< 5 years life expectancy