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Fig. 12E. —41-year-old woman with history of acute myeloblastic leukemia associated with abnormal eosinophils who presented with palpable mass in left breast. (Reprinted with permission from [10]) On sagittal MR imaging, mass is inhomogeneous and hyperintense on STIR image (D), hypointense on T1-weighted image (E). Mass enhances markedly but inhomogeneously after gadolinium administration and fat saturation (F). Mass spiculations and skin thickening also can be seen. Fine-needle breast biopsy revealed granulocytic sarcoma. Patient received two courses of chemotherapy. Five weeks later, mass was no longer palpable.