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X-ray(well-defined “expansile lesion” Osteochondromas- MC in the knee area. Exophytic lesion emerging from metaphysis on x-ray. Usually benign in children; may be metastatic in adults. Osteoid osteomas- MC Young males with intense bone pain responding to aspirin. X-Ray- “coin-lesions” . Musculoskeletal MR Imgaing: (page 407-409) ................
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