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Fig. 1A —67-year-old postmenopausal woman with nonpalpable developing asymmetry (visible in two projections, concave-outward contour, interspersed with fat) in left upper outer portion of breast detected on screening mammography. Diagnostic images show summation artifact. Follow-up mammograms (not shown) 24 months after screening and linkage with regional tumor registry showed no evidence of cancer. Mediolateral oblique projection mammogram of left breast obtained at previous screening shows no abnormal findings.