Stenting for Ischemic Strokes Secondary to Medically Refractory Intracranial Atherosclerotic Disease

Inclusion Criteria: * Adult patients with ICAD resulting in 70-99% vessel stenosis who undergo PTAS with any device * Patients will have to experience a stroke despite medical management involving risk factor modification and an antiplatelet agent * Baseline modified Rankin Scale (mRS) ≤ 3 * Performance of the endovascular procedure at least 3 days after the last stroke Exclusion Criteria: * Large vessel occlusion strokes undergoing rescue intracranial stenting will not be included * Baseline modified Rankin Scale (mRS) \>3 * Performance of the endovascular procedure less than 3 days after the last stroke. * Patients undergoing intracranial stenting for first stroke caused by ICAD * Adult patients with ICAD resulting in \<70% vessel stenosis