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Fig. 1. —39-year-old woman who had recently undergone excision of nonpalpable, mammographically detected right lower inner-quadrant spiculated mass yielding infiltrating ductal carcinoma and ductal carcinoma in situ (DCIS) with tumor at margin. Postoperative mammogram (not shown) revealed dense breasttissue with no suspicious findings. Contrast-enhanced fat-saturated T1-weighted sagittal MR image of right breast obtained approximately 1 month after surgery shows 1.3-cm irregular, spiculated mass with heterogeneous enhancement in right lower outer quadrant (arrow), remote from lumpectomy site, highly suggestive of malignancy. At MR imaging—guided needle localization and surgical excision, this lesion was found to represent 1.7 cm of infiltrating ductal carcinoma and DCIS. Patient under-went mastectomy.