[Cystic ectasia of the rete testis: apropos of a case].

We report a case of a simple testicular cyst developing on the rete testis. Nine cases have been reported in children. In our patient, the cyst was associated with aplasia of the homolateral kidney and termination of the left ureter in the left deferens. According to the literature, the diagnosis is usually fortuitous at histology examination. The cause is probably embryonic malformation. Castration is the therapeutic solution. In our case, simple enucleation allowed preservation of the deferens since the controlateral tree was damaged. There have been no complications with a 6-year follow-up.