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A 35-year-old female presents to your office after incidental finding of a aggressive looking lytic lesion in her pelvis. She has no pain, is not pregnant, but states she has been losing weight over the last 6 months for an unknown reason. Bone scan shows significant uptake in the area of her pelvis. Immunohistochemistry stains positive for smooth muscle actin. Which of the following slides correlates to your expected findings on histology?
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HPI - 3 weeks of pain. Limping.
Based only on the radiographs, what is the most likely diagnosis?