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Fig. 2F. —70-year-old woman recently diagnosed with cancer of left breast in whom MR imaging showed mammographically occult lesion in right breast. Needle artifact is shown at level of grid (E) and through lesion (F). Note that needle guide is not visualized on any of the MR images. Actual grid itself is not visualized; however, cross-hatchings of grid are seen because of pressure indentation on skin. Histologic analysis revealed infiltrating ductal carcinoma and ductal carcinoma in situ.