Inferior vena caval obstruction from a horseshoe kidney: report of a case with operative decompression.

Horseshoe kidney is a common anomaly with frequent associated anomalies. The confluence of the lower poles of the kidneys lies anterior to the inferior vena cava. The authors were unable to find any reports in the world's literature of a vena caval obstruction caused by the presence of a horseshoe kidney. The authors report such a case presenting as bilateral lower leg swelling.