Here is a "horseshoe" kidney. This is a congenital anomaly that may occur in association with other anomalies or syndromes with specific genetic defects such as trisomy 18. However, it can also occur as an isolated anomaly and an incidental finding. The uncommon potential problem here is that the ureters take an abnormal course across the "bridge" of renal tissue and this could lead to partial obstruction with hydronephrosis.