Pediatric Gynecomastia

Etiology: Imbalance between estrogen action relative to androgen action at the breast tissue level leads to benign ductal and stromal proliferation in a central location underneath the nipple resulting in an excess of male breast tissue
US: Unilateral, retroareolar, hypoechoic mass
DDX:
Complications:
Treatment: Usually reversible on its own
Clinical: Presents with palpable, firm, mobile breast mass

Radiology Cases of Gynecomastia

US of gynecomastia — Transverse US of the right breast (left) shows a retroaerolar, primary hypoechoic mass in the subcutaneous breast tissue. A transverse US of the same area in the normal left breast (right) is provided for comparison.