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(a) Occluded right ICA with absent flow seen on color-duplex. Right ECA has adequate flow although severe atherosclerosis is evident based on turbulent color flow images. (b) Color-duplex images of left carotid system with >70 % critical stenosis in proximal left ICA and a patent left ECA.
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Bilateral common (CCA) and external carotid arteries (ECA) were patent though diffusely atherosclerotic with an estimated plaque burden more than 50% (Figures 1(a,b)). 