Drug Coated Balloon Versus Stenting in Patients With Symptomatic Vertebral Artery Stenosis：an Observational Clinical Study

Inclusion Criteria: 1. aged between 18 and 80 years old; 2. TIA or non-disabling ischaemic stroke of the posterior circulation; 3. symptoms occurred in the 14 days and could not be relieved after 2 months of regular medication 4. stenosis of the vertebral artery of 50% or greater, diagnosed by both CT angiography or angiography; 5. NIHSS≤ 6; 6. score on the modified Rankin scale ≤ 3. Exclusion Criteria: 1. Active bleeding or coagulation disorders or severe renal/liver impairment 2. allergy to iodinated contrast agent or related medicines; 3. acute stroke in 3 weeks 4. more than 1 stenosis at the target vessel or Distal vascular dysplasia (diameter≤3mm) 5. a potential cause of stenosis other than atherosclerosis 6. Severe stenosis was found in the anterior circulation artery(\>70%) 7. intracranial hemorrhage or hemorrhagic stroke, intracranial tumor, cerebral arteriovenous malformation, or intracranial aneurysm in 30 days; 8. ISR patients; 9. Severe calcification lesion； 10. obvious thrombosis in vessel; 11. pregnancy; 12. a potential cause of TIA or minor stroke other than stenosis in a vertebral artery.