Yo Ahn Choi’s research while affiliated with Soonchunhyang University and other places

Gynecomastia refers to persistent enlargement of the breast in males caused by enlargement of the breast bud and surrounding stroma. It typically occurs in newborns, during early adolescence, and in late adulthood. There are several pathological causes. If no pathological cause is evident, gynecomastia is considered idiopathic. The reported prevalence of unilateral gynecomastia is approximately 35% to 45%, but most previous reports have focused on distinctive pathologic causes. As such, few previous reports of idiopathic unilateral gynecomastia during early adolescence have been published. Herein, we report a case of idiopathic unilateral gynecomastia in an adolescent male.