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Fig. 2. —65-year-old man with right carotid bruit undergoing treatment with intraaortic balloon pump. Image represents false-positive error in sonographic interpretation.

B, Color Doppler sonogram of right internal carotid artery (straight arrows) shows turbulence in tortuous vessel. Note plaque and no area of narrowing that would be consistent with critical stenosis. Because of tortuosity, angle of insonation may be inaccurate, and velocity should be interpreted with caution (vessel in blue is jugular vein). Also note focal area of flow reversal (curved arrow) that corresponds to posterior ulcer seen in C.