1 Southern California Permanente, Medical Group, 1050 West Pacific Coast Highway, Harbor City, California 90710
In patients with unilateral cryptorchidism, not only is the descended testis sometimes defective so far as fertility is concerned,1 but sometimes it is the descended testicle that develops the neoplasm. For example, Johnson et al.2 report that "approximately one out of five testicular tumors reported in patients with a history of (unilateral) cryptorchidism have developed in the contralateral scrotal testis." Another reference3 reports a one in six incidence in the descended testis.