FIG 3. A 65-year-old man without any neurologic symptoms during CEA.

A, Contrast-enhanced MR angiogram shows short segmental severe stenosis of the left proximal ICA. The contralateral ICA is occluded at the level of the carotid bifurcation.

B, Three-dimensional TOF MR angiogram shows intact both A1 segments, anterior communicating artery, and ipsilateral posterior communicating artery. The circle of Willis is complete in both anterior and posterior parts.