Findings, case of 58 y/o man with palpable left breast mass

Imaging Findings

This man's mammogram demonstrates a focal opacity (arrow) in the central retroareolar region of the left breast. The more typical mammographic appearance of gynecomastia is a flame-shaped opacity which extends and expands posteriorly from the nipple. This flame-shaped opacity is better demonstrated on a craniocaudal mammogram from another patient (arrow). (The lead marker denotes the nipple.)

This man's diffusely dense bones are demonstrated on a plain radiograph of the pelvis. A magnetic resonance image (MRI) of his humerus shows diffusely hypointense T1-weighted signal (arrows) in the bone marrow caused by the presence of innumerable mast cells.

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