Osteoblastoma Wheeless

Description: Discussion: - unusual benign osseous tumor; - it resembles osteoid osteoma in some respects buts is larger (>2 cm); - unlike osteoid osteoma: - occurs in older adolescents and young adults; - osteoblastoma usually does not cause localized night pain, and when pain occurs, pain is usually not relieved by ASA; - intense bony reaction that is seen w/ osteoid osteoma, does not occur with osteoblastoma; - osteoblastoma more often located in the posterior elements of vertebra; - osteoblastoma will not resolve spontaneously; - sites of involvement: spine, femur, bone of the foot; - an associated soft tissue mass may be seen in about 25% of patients; - in rare cases, malignant transformation is possible