[Unilateral agenesis of the vas deferens, a clinical sign useful for the diagnosis of genitourinary malformations].

Unilateral absence of the vas deferens is a rare anomaly in healthy men. Its infrequently clinical sign has been associated with ipsilateral genitourinary anomalies in the 80% of cases. We report a clinical case of a asymptomatic youngman with unilateral absence of the left was deferens presented in the time of elective vasectomy and associated with ipsilateral genitourinary anomalies. We review the literature about it. In conclusion, the palpation of the vas deferens should always be part of routine urological examination.