Transverse testicular ectopy with common deferent duct

: Transverse testicular ectopia is a malfunction of which there are 65 cases described in the Western literature. The pathogeny is unknown, although in the cases in which it is associated with persistence of Mullerian residue, it is attributed to a defect in the secretion of MIF (Mullerian inhibiting factor). In the other cases the fundamental cause is considered to stem from alterations in the vascularization of the genital crest, which determines the type of testicular ectopia. We present a case of crossed testicular ectopia with common deferent duct in a three-year-old male, treated by means of descent and transposition via the interscrotal septum with modified Ombredanne's technique.