Prearterial external iliac vein as a rare anomaly of the iliac vein.

The coexistence of a retroperitoneal venous anomaly requires special consideration during open aortoiliac surgery. Anomalies of the external iliac vein are rare, and no anomalies of the right external iliac vein, which passes ventral to the external iliac artery, have been reported in the English literature to the best of our knowledge. We herein report the first case of Leriche syndrome combined with a prearterial external iliac vein treated with bypass surgery and a synthetic bifurcated graft.