The value of transrectal ultrasonography in the diagnosis and treatment of partial obstruction of the seminal duct system.

We report a case of male subfertility with ejaculate volume less than 1 cc and moderate oligoasthenozoospermia. Partial obstruction of the seminal duct system was suspected and transrectal ultrasonography revealed a müllerian duct cyst. We confirmed the diagnosis with transperineal puncture and contrast filling of the cyst and seminal vesicles. This procedure allowed us to avoid scrotal vasostomy and perform conventional vasography as well as to measure the distance between the ceiling of the cyst and the urethra, which facilitated subsequent transurethral surgery.