Fig. 2. Type 2 nutcracker phenomenon.

A. Schematic diagram showing the compression of the LRV posteriorly by the origin of the right renal artery (arrow). B, C. Type 2 compression of the LRV in a 68-year-old male with proteinuria. Greyscale (B) and color Doppler US (C) images of the LRV show that the space between the AA (a) and SMA (s) is not narrow, but the LRV is compressed posteriorly by the origin of the right renal artery (arrows). Note the bright-colored jetting of the blood flow (arrowheads) from the site where the right renal artery compresses the LRV. Supplementary video 2 is a video-clip of color Doppler US (C). AA = abdominal aorta, LRV = left renal vein, SMA = superior mesenteric artery, US = ultrasound