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US and X-ray images of a 11-year-old girl with OS local recurrence after limb salvage with metal implants. It was easy to see the lesion in US but not in X-ray image. (A) A heterogeneous echogenic mass in the longitudinal plan of US image. (B) Color Doppler and power Doppler US image of the mass. (C) No obvious lesion was found I the X-ray image.
