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Figure 1A. Left: Patient 1. Hypertrophic callus formation appeared two months after a fracture of the right femur that was surgically treated by internal fixation with intramedullary telescopic rod along with corrective osteotomy.
Figure 1B. Right: Patient 2. Magnetic resonance imaging of a large lobulated mass of 18–20 cm in the distal femur surrounded by a thick calcified shell.
