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Figure 1. Computed tomography in a 52-year-old woman with mild episodic gross hematuria revealed compression of the left renal vein between the superior mesenteric artery (SMA) and the aorta (Ao) before the vein merges into the inferior vena cava (IVC). This compression caused marked dilatation of the distal part of the renal vein (RV). The renal venous congestion caused hematuria, presumably through the rupture of submucosal veins into the renal pelvis. No treatment was given. Entrapment of the renal vein is a known cause of hematuria.
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