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Examples of the mediolateral oblique (MLO) view (row 1) and cranial caudal (CC) view (row 2) digital mammogram images, illustrating the four qualitative Breast Imaging and Reporting Data System (BI-RADS) breast density categories, i.e., fatty (column 1), scattered density (column 2), heterogeneously dense (column 3), and extremely dense (column 4)
