[Cryptorchism yesterday and today. Update study programmed in interdisciplinary services]

It is more than 25 years that several Authors stress the need of an early treatment of undescended testis both mono or bilateral. The pathogenesis of undescended testis is still unknown, but some suggestions about the hormonal role has been formulated. From these considerations "interregional groups to study the cryptorchidism" has been formed, in order to use the same parameters of evaluation: auxologic studies, cytogenetic analysis, hormonal tests, dynamic hypophyseal functionality test, medical treatment, surgical treatment, biopsies, postoperative hormonal treatment, seminal evaluation after 20 years of life. From all these studies a protocol has been planned, including a treatment by HCG associated with urophollitropine as pure FSH stimulating effect and an eventual surgical treatment before the 5th years of life.