Clinical, Morphological and Biochemical Studies of a Virilizing Tumor in the Testis*

Although there is considerable indirect evidence indicating that virilizing testicular tumors exert their effects by producing androgenic steroid hor- mones, few attempts have been made to determine the exact nature of the compounds produced. One type of tumor which exerts particularly marked virilizing effects when found in prepubertal boys is that classified as an interstitial cell tumor of the testes (1-21). It has been well established that * This work was supported by Contracts no.