any stenosis of an extracranial carotid or vertebral artery, another intracranial artery, subclavian artery, coronary artery, ... Index stroke is attributed to 70-99% stenosis (or flow gap on MRA) of a major intracranial artery (carotid artery, middle ... Intracranial arterial stenosis due to: arterial dissection; MoyaMoya disease; any known vasculitic disease; herpes zoster, ... Major surgery (including stenting of any vessel; open femoral, aortic, or carotid surgery; or cardiac surgery) within previous ...