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Fig. 3A. —Step-oblique mammography requiring additional spot compression magnification (SCM) mammography for lesion seen well only with fine-detal technique. Poorly defined density (arrow, B), seen at first in inner right breast only on screening craniocaudal (CC) view, persists on craniocaudal spot compression magnification (CC SCM) image, in which margins appear spiculated. Density not seen on screening 60° mediolateral oblique (MLO) view. Step-oblique images obtained in 15° increments using SCM (over expected region of density) show spiculated density much more readily than on whole-breast step-oblique images (not shown), validating presence of mass and permitting precise localization. Imaging-guided tissue diagnosis (also not shown) revealed infiltrating ductal carcinoma. Screening mammograms at 60° MLO projection (A) and 0° CC projection (B).

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