Testicular Tumors in 2 Families

Abstract
Testicular cancers in closely related family members are rare. The 2nd incidence of pure seminoma occurring in a father and son is reported. The increased risk of malignant tumors developing in the undescended testis is well established. The 2nd reported incidence of testicular cancers occurring in 2 non-twin brothers, in which 1 cancer developed in an undescended testis, is also reported.