Skeletal radiology
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A case of postradiation osteosarcoma of the patella in a 54-year-old man was presented. The lesion in the patella was diffuse and highly sclerotic, and was partially radiolucent in radiographs. ⋯ Diagnostic criteria, clinical features, and radiographic findings of postradiation sarcoma were described. The rarity of osteosarcoma of the patella was emphasized.