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Old 10-31-2012
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Correct Answer G is correct

This patient has an osteoid osteoma, a benign tumor of the bone that occurs in children and young adults. Pain
disproportionate to the size of the tumor is characteristic. If such a lesion is larger than 2 cm, it is classified as an
osteoblastoma. It can be treated effectively by curettage. The acute pain is mediated by release of prostaglandins, so
aspirin is an effective analgesic. An enchondroma is a benign tumor of hyaline cartilage that arises in the medullary space
in young adults. Ewing sarcoma is a diaphyseal lesion composed of primitive, small, round blue cells. Fibrous dysplasia is
a localized area of developmental arrest of bone formation. A giant-cell tumor is a benign but locally aggressive lesion that
arises in the epiphysis of the long bones of young adults and has a “soap bubble” radiographic appearance. An osteochondroma is a projection of the cartilaginous growth plate to form an exostosis. An osteosarcoma is an infiltrative,destructive metaphyseal lesion
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