A palpable nodule in the left breast of a 55-year-old man.

<p>(a) Transverse ultrasound shows an irregular shape, a noncircumscribed margin, and a heterogeneously hypoechoic, solid nodule (straight arrow) with the center 1 cm away from the nipple. The nodule has an echogenic halo (curve arrows) and a markedly eccentric relationship to the nipple. (b) Color Doppler ultrasound shows absent color signal in the nodule (arrow), categorized as a low color flow signal. (c) Pathology specimen mainly shows fibroadipose stromal tissue with stromal fibrosis, myxoid degeneration, and focal fatty necrosis. No mammary gland tissue or malignant cells can be identified. (Hematoxylin-eosin, original magnification ×200).