Benign disorders of the male breast.

Gynecomastia is the dominating problem of the male breast. Other diseases are rare but mimic the same conditions in women. Gynecomastia may occur at any age either as a primary event, when it is due to a minor hormonal imbalance, or secondary to other pathology (e.g., liver failure) or drugs. Treatment consists of assessment of cause and reassurance. In a minority of patients, treatment with drugs--such as danazol--or surgical resection is indicated.