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BI-RADS 4a. In a 47-year-old-woman, with a palpable left breast lump, B-mode US showed a 3.4 cm FBL. According to BI-RADS, with S-Detect (green line contour) this FBL was described as an oval-shaped hypoechoic mass with parallel orientation and enhancement as posterior feature (arrow). Margins were partially circumscribed (< 75%) and partially indistinct. Core-needle biopsy proved the mass to be a mucinous carcinoma
