Figure 10.

Gynecomastia masking a small cancer in a 75-year-old man presenting with a palpable right retroareolar mass, who had a history of chest irradiation for lymphoma treatment but no known family history or genetic mutation. (a, b) Diagnostic MLO (a) and CC (b) mammographic views show bilateral flame-shaped dendritic gynecomastia on both views. In the retroareolar area of the right breast, a minimally increased density (arrow on b) was depicted on the CC view. (c) Targeted gray-scale US image of the retroareolar region of the right breast shows an irregular mass (arrows) central to the nipple. Biopsy of this mass was performed, and histopathologic analysis showed a diagnosis of ER-positive, PR-positive, HER2-negative invasive ductal carcinoma.