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Fig. 3B —60-year-old postmenopausal woman with nonpalpable developing asymmetry in left upper outer portion of breast detected on screening mammography (visible in two projections, concave-outward contour, interspersed with fat). Core biopsy revealed invasive ductal carcinoma. Craniocaudal projection mammogram of left breast shows developing asymmetry (arrow) in outer aspect. This asymmetry was not present on previous screening mammography (not shown).