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Fig. 3. —77-year-old woman with unexplained dizziness. Her case represents false-positive error with accurate sonographic interpretation but discrepant angiographic results.

A, Color duplex Doppler sonogram of left internal carotid artery shows proximal stenosis (arrow) with peak systolic and diastolic velocities of 388 and 198 cm/sec, respectively. Internal carotid artery/common carotid artery velocity ratio was 6:4. Both color and duplex Doppler data were consistent with critical (80-99%) stenosis. Color and duplex Doppler sonogram of right side show complete internal carotid artery occlusion.





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