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