Description:
A rare tumor that usually forms in the testicles. It may also form in the ovaries, but this is very rare. Leydig cell tumors make a male sex hormone called testosterone. These tumors can cause early puberty and an abnormal growth of breast tissue in males. In females, they can cause male features such as facial hair and a deep voice. Leydig cell tumors are usually benign (not cancer), but they may sometimes become malignant (cancer). Leydig cell tumors tend to have a good prognosis if diagnosed and treated early. They can occur in both adults and children. Leydig cell tumors are a type of sex cord-stromal tumor.
