Definition: Gonadal interstitial or stromal cell neoplasm composed of only LEYDIG CELLS. These tumors may produce one or more of the steroid hormones such as ANDROGENS; ESTROGENS; and CORTICOSTEROIDS. Clinical symptoms include testicular swelling, GYNECOMASTIA, sexual precocity in children, or virilization (VIRILISM) in females.
/blood supply /chem /second /secret /ultrastruct permitted; coordinate IM with TESTICULAR NEOPLASMS (IM) in male or OVARIAN NEOPLASMS (IM) if in female