Endovascular TechniquesVertebral 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