[Malignant change of undescended testis: report of 13 cases].
D000328:Adult; D000367:Age Factors; D003456:Cryptorchidism / Q000150:complications* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D013736:Testicular Neoplasms / Q000209:etiology*