Figure 2 Right RAS in the same patient shown in Figure 1 on contrast-enhanced color Doppler ultrasound (shown here in gray scale). The renal artery is shown originating from the aorta in this transverse image. The superior mesenteric artery (1) is seen anterior to the aorta (2). The tight ostial RAS (arrow) can easily be appreciated on this image. Turbulent flow distal to the stenosis is seen as a markedly heterogeneous color display. Abbreviation: RAS, renal artery stenosis. Source: Courtesy of James Pilcher, St. George's Hospital, London.
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