马蹄肾，是一种先天性的异常，常和其它异常或特殊基因缺陷而引起的综合征有关。也可单独发生。可能是输尿管穿过肾脏组织“桥”时的路径异常造成的。这样可能导致部分梗阻而致肾盂积水。
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.
