Within the age group 10 to 35 years, the incidence of carcinoma of the testis in males with intra-abdominal testes is:

D. Twenty times greater than that in the general population.

DISCUSSION: The incidence of carcinoma of the testis is greater in patients who have cryptorchidism, whether corrected or not; because of this, routine self-examination by patients who have undergone operation for cryptorchidism is important. For patients who have uncorrected intra-abdominal testes it is estimated that the incidence of the development of carcinoma of the testis in the age group 10 to 35 years is approximately 20 times greater than that for the general population. If cryptorchidism is diagnosed after the age of 10 to 12 years, orchiectomy may be the preferred treatment, since such testes rarely exhibit normal function, despite adequate scrotal placement, and put the patient at great risk for an intra-abdominal neoplasm that will be difficult to diagnose.