OBJECTIVE To report an additional case of congenital urethral diverticulum that was incidentally discovered in an adult patient that presented with prostatic syndrome. METHODS The clinical features diagnosis and treatment of this urethral anomaly are discussed. CONCLUSIONS Congenital urethral diverticulum is an uncommon finding that usually requires treatment only if it is large or causes important symptoms. The patient described herein had a small urethral diverticulum that did not require treatment. However, the dome of the diverticulum was ruptured during urethrocystoscopy, thus facilitating drainage.