Giant seminal vesicle cyst causing ipsilateral hydronephrosis with contralateral renal agenesis.

Seminal vesicles cyst (SVC) associated with ipsilateral renal agenesis is a rare condition. Until now, contralateral renal agenesis has been found together with SVC in only 3 cases. We report the first case in the literature where contralateral renal agenesis was seen together with giant SVC, causing ipsilateral ureteral obstruction with rising of serum creatinine.