Figure 2a. Benign-appearing area, too small to prompt recall, rated as BI-RADS category 2 at unblinded review and recalled by no radiologists at blinded review. (a) Craniocaudal and (b) mediolateral oblique mammograms in a 64-year-old woman show a 3-mm round dense area (arrows) in the upper inner quadrant of the right breast. Twelve months later, (c) craniocaudal and (d) mediolateral oblique mammograms show a 7-mm mass (arrows) in the same location. Biopsy results indicated grade III invasive ductal carcinoma.