Cyst of the ejaculatory duct/urogenital sinus.

We report a case of a midline cyst involving both ejaculatory ducts and seminal vesicles. There have been only 3 previous reports in the literature of ejaculatory duct cysts, 1 of which was iatrogenic, and all have been unilateral. However, several cases have been reported of cysts arising from the müllerian duct or seminal vesicle, in which the described anatomy is essentially identical to our case. It is proposed that midline retroprostatic/retrovesical cysts that communicate with both wolffian systems be classified as urogenital sinus cysts.