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FIG 2. A 62-year-old man with a history of sudden loss of consciousness immediately after vascular clamping during CEA.
A, Contrast-enhanced MR angiogram shows focal severe stenosis of the left proximal ICA and occlusion of the contralateral ICA.
B, Three-dimensional TOF MR angiogram demonstrates incomplete anterior and posterior patterns of the circle of Willis with absence of the right A1 segment of the anterior cerebral artery and the left posterior communicating artery.
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