Arch aortography revealing a Type II arch. (a) Totally occluded innominate artery (black arrows) and left subclavian artery (white arrows). Note the left common carotid artery with 50% ostial stenosis (white arrow head). (b) Left subclavian artery (white arrow head) is heavily calcified and totally occluded. It is filled via retrograde flow from left vertebral artery (black arrows). Right subclavian artery (white arrows) is filled via retrograde right vertebral and carotid arteries (not seen well on this angiogram).
