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Breast density patterns. A) BI-RADS I = fatty breast (<25% dense). B) BI-RADS II = scattered densities (25%–50% dense). C) BI-RADS III = heterogeneously dense (51%–75% dense). D) BI-RADS IV = extremely dense (>75% dense). BI-RADS = Breast Imaging Reporting Data System.
