Polyorchidism: report of three cases and further embryological considerations.

We report 3 new cases of polyorchidism. Review of the literature allows two groups of anatomical variations to be identified: (1) where the Wolffian duct is duplicated longitudinally or absent, and (2) where the two testes are drained by the same epididymis and vas deferens. We postulate that the first group results from a primary anteroposterior division of the genital ridge, whereas the second group is the result of a transverse duplication.