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Fig. 4A —43-year-old woman with sonography screening of mammographically dense breast. She had undergone right mastectomy due to breast carcinoma 2 years previously. Left mammogram (not shown) showed homogeneous dense parenchyma without abnormalities. Sonography image at time of screening mammography shows 4-mm hypoechoic mass with noncircumscribed mass, classified as BI-RADS category 4.