A 70-year-old woman, with a medical history of breast cancer treated with mastectomy 11 years before presentation, had a new firm mass in the contralateral breast. The patient did not have nipple discharge or skin changes. Physical examination revealed a firm, nontender, mobile mass in the right lower outer quadrant at the 7-o'clock position. No axillary adenopathy was present. There was no skin thickening, skin or nipple retraction, or erythema. The patient did not have a history of trauma.
IMAGING FINDINGSThe craniocaudal and mediolateral oblique views (Fig 1a, 1b) of the right breast did not reveal a focal abnormality in the region of the palpable breast mass. The location of the breast mass was marked with a metallic marker. The spot compression view also did not reveal an underlying mass (Fig 1c). Ultrasonographic (US) examination revealed a homogeneously echogenic mass (Fig 2) without posterior acoustic enhancement or shadowing that was 9 mm in diameter, and the skin overlying the mass appeared to be normal.