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Having mammographically dense breasts impedes performance of screening mammography and has been associated with excess risk for breast cancer. Radiological categories of breast density are: almost entirely fat, scattered fibroglandular densities, heterogeneously dense, or extremely dense (the first two categories defined as “nondense” and the latter two as “dense”). Many states have mandated that information on breast density be communicated to women, focusing attention on supplemental breast imaging. Investigators analyzed prospectively collected observational data from screening mammograms performed between 2011 and 2013 (145,123 women, 216,783 screens; mean age, 58; 80% non-Hispanic white) from 30 U.S. radiology centers (83 radiologists)…