Seminal duct abnormalities occur more often than generally assumed. In most cases, they remain undetected if diagnostic measures are not undertaken because of infertility or recurrent urinary tract infections. An IVP should be performed if aplasia of the vas is detected, since ipsilateral agenesis of the kidney may also be present. In spite of the improved techniques available today, reconstructive surgery on seminal duct abnormalities usually yields poor results.