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Plain radiograph of the distal femur of a male, 18 years of age, showing osteolytic lesion with a soft-tissue mass. A diagnosis of osteosarcoma was confirmed on biopsy of the lesion (Reproduced with permission. In: Peter Renton, ed. Orthopaedic Radiology: Pattern Recognition and Differential Diagnosis. 1st Ed. London, UK: Martin Dunitz Ltd.; 1990. Figure 3.68a, p. 190. Copyright 1990 Taylor & Francis. All rights reserved).
