A 33-year-old woman was admitted with macrohematuria after contusion in the left lumber region. The excretory urogram showed no abnormal findings, but color doppler and RI-angiography revealed infrarenal left-sided inferior vena cava (left IVC). The pressure in the dilated left renal vein was higher than that in the right one. Renal contusion in addition to the congestion of the left renal vein due to left IVC was thought to be the cause of hematuria in this case. Hematuria disappeared after retrograde instillation of 0.2% AgNO3 water solution into the left renal pelvis. Left IVC rarely presents clinical symptoms, and is usually found by chance on CT scan or ultrasonography during examinations for upper abdominal organs. Our case is the 69th one of left IVC in Japan, and belongs to Type 2' according to our classification of left IVC.
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