Answer the question.

Q. An 11-year-old girl has a painless bump behind her knee. However, she does have pain if she her leg is hit while playing soccer. On physical examination there is a firm lump behind the knee. A plain radiograph of the knee is shown. The most likely diagnosis based on the history, physical examination and plain radiograph is:
A) High-grade intramedullary osteosarcoma
B) Parosteal osteosarcoma
C) Periosteal osteosarcoma
D) Osteochondroma


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