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. 2021 Jan 2;28(2):254–262. doi: 10.1007/s12282-020-01203-y

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© The Author(s) 2021

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Fig. 5 — A case of focal density on mammography. a Mammography: focal density (allow), SMC 3 (SMC4 if it is developing asymmetry). b Screening ultrasound: hyperchoice mass with indistinct margin, SUC 4. Overall assessment category: SC 4. Histopathology: invasive ductal carcinoma. This case may be difficult to detect with screening ultrasound, especially when performing ultrasound without reference to mammography findings (separate mammography/ultrasound method) (SMC screening mammography category, SUC screening ultrasound category, SC screening category)