Serial radiographs of the knee of a young child show a rapidly expanding lytic lesion in the distal femur in addition to static findings of squaring of the femoral condyles, epiphyseal overgrowth, and generalized osteopenia. Which of the following is the most likely diagnosis for the expansile femoral lesion?

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The Answer of Serial radiographs of the knee of a young child show a rapidly expanding lytic lesion in the distal femur in addition to static findings of squaring of the femoral condyles, epiphyseal overgrowth, and generalized osteopenia. Which of the following is the most likely diagnosis for the expansile femoral lesion?

Serial Radiographs of the Knee of a Young Child Show