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Figure 8d: Mammography and MR imaging of the breast. (a) Left craniocaudal and (b) left mediolateral oblique mammograms demonstrate an irregular high-density mass (*). Overall, breast tissue density is heterogeneous, which is consistent with patient's age (35 years). Biopsy results showed the mass to be grade III invasive ductal carcinoma. (c, d) Transverse three-dimensional fast spoiled gradient-echo MR imaging (21.4/4.2) was performed to assess remaining breast tissue. (c) Enhancing mass corresponds to the known biopsy-proved breast cancer. (d) Incidental mass (arrow) was found posteriorly in the same breast. Biopsy was performed later with US guidance, and the mass found to be grade I invasive ductal carcinoma. This mass was not evident on the mammogram, either initially or in retrospect. (Image courtesy of Lonie Salkowski, MD, Medical College of Wisconsin, Milwaukee, Wis.)
