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Figure 6a. (a) Mediolateral oblique (left) and craniocaudal (right) mammograms in a 75-year-old woman with a subtle spiculated mass (arrows) in the right breast. The mass was rated as BI-RADS category 0 at unblinded review and was recalled by only one of five radiologists at blinded review. (b) Mediolateral oblique (left) and craniocaudal (right) mammograms obtained 12 months later show a larger spiculated mass (arrows). Note that the mass is slightly more anterior on the mediolateral oblique view than on the mediolateral oblique view in a because of differences in obliquity. Pathologic findings showed a 1.5-cm invasive lobular carcinoma.