Orthopaedic Surgery

	Answer 3 Osteoid osteoma. Osteoid osteoma is a benign osteoblastic tumor consisting of a central core of vascular osteoid tissue (nidus) and a peripheral zone of sclerotic bone. Typically, these tumors occur in young patients (age, 7-25 yr), with an almost 3:1 male predominance.2 These benign osseous tumors are painful because of high levels of local prostaglandins within the tumor; pain relief with aspirin, NSAIDs, and salicylate drugs is characteristic of these tumors. This patient’s characteristic initial response to NSAIDs and described presentation are diagnostic for an osteoid osteoma.2 A Brodie’s abscess typically has signs of infection (eg, swelling, erythema, fevers), and an aneurysmal bone cyst has a classic expansile, eccentric, lytic lesion on plain radiographs. The radiographic findings in this case are not suggestive of fibrous dysplasia or a femoral neck stress fracture. REFERENCE 2. Aboulafia AJ, Kennon RE, Jelinek JS. Benign bone tumors of childhood. J Am Acad Orthop Surg 1999;7:377-88. Click here to return to the questions
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