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A 49-year-old woman presented with the characteristic Gottron sign and heliotrope rash. She reported progressive muscle weakness during the last 2 months. Blind screening with [18F]-FDG PET/CT (left panel) disclosed a uterine mass yielding a high standardized uptake value (SUV max = 12.8) (arrow). Hysterectomy revealed an undifferentiated uterine sarcoma. The right panel shows [18F]-FDG PET image
