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Fig. 2A. —58-year-old man with transient ischemic attacks in whom breath-hold contrast-enhanced MR angiography of carotid circulation was carried out. Coronal maximum-intensity-projection MR image reveals weblike, tight stenosis (white arrow) at origin of left internal carotid artery. Origins of great vessels (black arrows) from aortic arch are sharp and well visualized. Left carotid bifurcation and vertebrobasilar system are also clearly visible. Tight stenosis (arrowhead) in distal left vertebral artery is evident. Early filling of right subclavian and brachiocephalic veins (open arrow) does not obscure visualization of structures necessary for diagnosis.

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