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Fig. 3. —57-year-old man with verte-brobasilar ischemia in whom breath-hold contrast-enhanced MR angiography of carotid circulation was performed. Coronal maximum-intensity-projection MR image reveals large aneurysm (white arrow) at origin of basilar artery. Entire carotid circulation from aortic arch to circle of Willis is well visualized. Middle cerebral arteries (open arrows) are clearly visible bilaterally. Both carotid bifurcations (arrowheads) and great vessel origins (black arrows) appear sharp and clearly visualized.