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Figure 4b. Benign-appearing mass rated as BI-RADS category 2 at unblinded review that was recalled by no radiologists at blinded review. (a) Craniocaudal and (b) mediolateral oblique mammograms in a 64-year-old woman show several benign-appearing equal-density masses, with one of the masses (arrows) in the area of interest. Subsequent screening (c) craniocaudal and (d) mediolateral mammograms obtained 14 months later show a 1-cm mass (arrows) in the left breast, which was pathologically proven to be grade I invasive ductal carcinoma with cribriform and micropapillary DCIS.