Double vas deferens and epididymis associated with ipsilateral renal agenesis simulating ectopic ureter opening into the seminal vesicle.

A 26-year-old man presented clinical, radiographic and, at operation, macroscopic signs of an ectopic opening of the left ureter into the seminal vesicle and agenesis of the left kidney. However, histological examination of the surgical specimen revealed that the supposed ureter was actually a vas deferens, and the structure removed from the renal site showed a histological composition like that the epididymis. The anomaly observed was thus a retroperitoneal duplication of the vas deferens and epididymis and failure of development of the ipsilateral kidney and ureter.