Evaluation of the lower urinary tract function in caudal duplication (dipygus) anomaly.

Caudal duplication is a rare anomaly with less than 30 reported cases. For those patients who also have double bladders, there are not enough data regarding the function of the lower urinary tract. A boy with caudal duplication anomaly was evaluated fluoroscopically and urodynamically. The results of the evaluation showed that the bladders were filling and emptying synchronously with normal and almost identical detrusor pressures. The child did not require either or both bladders to be resected. Because the level of the duplication in dipygus cases varies, thorough evaluation of the lower urinary tract, including urodynamics, should be considered for every case.