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Low-grade liposarcoma. (a,b) Axial FDG PET-CT (a) and a concurrent axial CT image (b) of the thigh show a fatty tumor surrounding the sartorius muscle of the right thigh with a region of increased metabolic activity (white arrowheads) as well as a more posterior region where metabolic activity is low. The patient had pain in the mass, which at biopsy was found to be a low-grade liposarcoma.
