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A 56-year-old woman with supplemental screening ultrasound (US)-detected breast cancer (invasive ductal carcinoma, intermediate histologic grade, hormone receptor positive/HER2 negative). Transverse (A) and longitudinal (B) gray-scale US images show a 10-mm-sized irregular hypoechoic solid mass with spiculated margin and posterior shadowing. It was assigned BI-RADS category 4c.
