MEDizzy - A 15-yr-old boy presents with a palpable swelling of the

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Neoplastic Diseasesand Tumors

A 15-yr-old boy presents with a palpable swelling of the humerus that is associated with pain that awakens him at night. There is a sunburst pattern on the x-ray film. The most likely diagnosis is:

ExplanationPain and swelling are the most common presenting symptoms of osteosarcoma and Ewing sarcoma. Osteosarcoma has a characteristic sunburst pattern on x-ray films. Ewing sarcoma is associated with periosteal elevation, or "onion-skinning," on x-ray