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Fig. 6A. —57-year-old woman with microcalcifications in apocrine metaplasia. Spot magnification mammograms in craniocaudal (A) and mediolateral oblique (B) projections show several clusters of microcalcifications (arrows) due to fibrocystic changes, with microcysts and apocrine metaplasia. Observers variably described these as milk of calcium, benign (BI-RADS category 2), punctate or pleomorphic in multiple clusters and suspicious (BI-RADS category 4), or pleomorphic in segmental distribution and highly suggestive of malignancy (BI-RADS category 5).