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Fig. 2E Step-oblique mammography obtained for poorly defined noncalcified density (arrows) in inner left breast not clearly seen at first on mediolateral oblique (MLO) projection. Progressive 15° incremental step-oblique images show density represents true mass, localized to lower inner left breast. Note nipple (white dots). Imaging-guided tissue diagnosis (not shown) revealed infiltrating ductal carcinoma. ML = mediolateral, CC = craniocaudal projection. 30° MLO projection (E)