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。可为偶然发现，伴有或不伴有疼痛或触痛。首先要区分是否是假性男性乳房发育症，以避免不必要的诊治程序。应详细询问用药史并做仔细的体检来发现是否是药物引起，还是属于病理性的GYN或排除乳腺恶性变。治疗取决于病因，对于17岁以上、病程＞1~2年的GYN可能需要外科治疗。采用乳晕旁切口的手术切除结合吸脂术通常是外科医生不错的选择。

Treatment of gynaecomastia ZHENG Xin-yu, WANG Shou-tao. Department of Breast Surgery, the First Afficiated Hospital of China Medical University, Shengyang 110001, China Abstract Gynaecomastia (GYN), a benign enlargement of the male breast as a result of proliferation of the glandular component, is common in neonates，adolescents and older men. It may be an incidental finding，and may or may not be associated with pain or tenderness. GYN should be firstly differentiated from“false gynecomastia” to avoid an unnecessary workup. A general medical history and careful physical examination should be given to find the drugs that have been linked to gynaecomastia and to rule out pathologic causes and breast cancer. Treatment depends on the cause and surgery may be necessary in cases lasting more than 1~2 years beyond the age of 17. The use of a combination of surgical excision and liposuction through a periareolar incision represents the surgical approach of choice.