Male hypogonadism has a multifactorial etiology that icludes genetic conditions, anatomic abnormalities, infection, tumor, and injury. Tumors of the pituitary cause hypogonalism by by either mass effect or distruction of gonadotropes or by hormonal production, which inhibits the GnRH pulse generator. The nanifests of hypogonadism are testisterone deficiency, infertility, or both. Signs and symp…