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Figure 4. Ewing's sarcoma in the femoral diaphysis. (a) Anteroposterior radiograph shows subtle lucency in the mid-femur, with periosteal reaction and soft tissue mass. A prominent mass of periosteal new bone on the medial side of the femur shows smooth indentation called saucerization, typically found in Ewing's sarcoma. (b) Coronal short tau inversion recovery MRI shows the cause of saucerization—the periosteal new bone has been pressure-eroded by extraosseous tumour.
