Fig. 5
From: Imaging findings and classification of the common and uncommon male breast diseases
Gynecomastia vs. Primary breast malignity. a–c Fan-shaped central subareolar opacity, in mammography, and disk-shaped hypoechoic retroareolar tissue, in US (red arrows), with bilateral involvement (not shown) are typical imaging findings of gynecomastia (nodular form). b–d IDC of male breast. Irregular lesion with slightly eccentric location according to the nipple and higher density than accompanying background gynecomastia is seen in mammography. US shows ill-defined, hypoechoic, solid mass located outside of the nipple-areolar complex (yellow star) with unilateral involvement (blue arrows)