Gynaecomastia(GYN),a benign enlargement oft he male breast as a result of proliferation of the glandularc omponent,is common in neonates,adolescents and olderm en.

• 男性乳房发育症(GYN)是由于腺体组织的增殖导致的男性乳房良性的增大,常见于婴儿期、青春期及中年后期。