Intervention
Several techniques are available for ablation of osteoid osteoma. The tumor can be percutaneously ablated by using radiofrequency (RF), ethanol, laser, or thermocoagulation therapy under CT guidance. In spinal tumors, complete ablation or resection of the tumor is desirable but not always feasible.15,16,17,18,19,20,21,22,23
Percutaneous RF ablation is performed under CT guidance by using general or spinal anesthesia.24 After localization of the nidus with 1- to 3-mm CT sections, an osseous access is established with either a 2-mm coaxial drill system or an 11-gauge Jamshidi needle. RF ablation is performed at 90°C for 4-5 minutes by using a rigid RF electrode with a 1-mm diameter. The procedure is successful when the electrode is heated to the desired temperature within the nidus. In one series, clinical success was achieved in 96% of patients. All recurrences were treated with a second procedure, with a secondary success rate of 100%.
CT-guided percutaneous drilling of the nidus with subsequent ethanol injection to cause sclerosis in the remnants of the nidus has been achieved in a small series of patients. Percutaneous thermocoagulation under CT guidance has been performed to achieve ablation of a spinal osteoid osteoma.
Frequently, lesions are located near the joint surface, involve the vertebral body, or are close to major nerves. To determine whether RFA can safely be used in these cases, a study on an animal model was conducted.25 The study revealed the insulative effect of cortical bone. The authors showed that RFA always respected cortical bone, and therefore, articular cartilage was not damaged. RFA can therefore can be safely performed close to the joint surface without damaging the cartilage. There were no significant differences in lesion size, probe type, and the duration of the procedure.
Medicolegal Pitfalls
- Because backache is common, symptoms of an osteoid osteoma may be ignored, or an osteoid osteoma may not be considered as the cause.
- In one series, the average time from symptom onset to diagnosis was 28 months.
- The longer the duration of the symptoms, the lower the likelihood of complete correction of scoliosis associated with osteoid osteoma.
- Isotope bone scanning may reduce the time to diagnosis, and a scan may demonstrate positive findings in the absence of radiographic changes.
- Painful scoliosis is an indication for a radionuclide study.
- The diagnosis of intra-articular osteoid osteoma often is delayed because it may be confused with other forms of monoarthritis. Therefore, osteoid osteoma should always be considered in the differential diagnosis of monoarticular pain.
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References
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Further Reading
Related eMedicine topics
Osteoid Osteoma (Orthopedic Surgery)
Bone Infarct
Bone Island
Bone Metastases
Legg-Calve-Perthes Disease
Lymphoma, Bone
Osteoblastoma
Osteomyelitis, Chronic
Stress Fracture
Clinical guidelines
ACR Appropriateness Criteria® bone tumors. American College of Radiology - Medical Specialty Society. 1995 (revised 2005). 5 pages. NGC:004783
ACR Appropriateness Criteria® chronic hip pain. American College of Radiology - Medical Specialty Society. 1998 (revised 2008). 8 pages. NGC:006998
Keywords
osteoid osteoma, sclerotic bone island, benign bone neoplasm, benign skeletal neoplasm, bone lesion, bone neoplasm, skeletal lesion, skeletal neoplasm, cortical bone sclerosis, endosteal bone sclerosis, bone sclerosis, osteoblastic rimming, osteoblastoma, giant osteoid osteoma
Follow-up: Osteoid Osteoma