Description: This module begins with an overview of the normal male breast development and is following by a discussion on male breast disease and abscesses. The clinical, mammographic, and sonographic features of gynecomastia are expressed through clinical images. The final section topic is male breast cancer and the associated risk factors, clinical and sonographic presentation and common metastatic sources. Core Concepts: 30 min Focus Session: 25 min CME 0.5 SDMS CME