[Five cases of malignancy in the cryptorchid testicles].

Five cases of testicular tumor which originated from cryptorchid testis are presented. One of these cases showed complete remission for 3 years by multidisciplinary therapy including lobectomy. In Japanese literature, we found 182 cases of testicular tumor originating from cryptorchid testis and 29 cases whose testicular tumor occurred after orchidopexy.