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Images in a 46-year-old woman with right breast ductal carcinoma in situ who underwent mastectomy after a greater extent of disease was seen on MRI scans. (A) Maximum intensity projection and (B) first postcontrast axial T1-weighted subtraction images show segmental nonmass enhancement (arrows) measuring 70 mm in the upper outer quadrant of the right breast. Span of disease measured 30 mm at mammography.
