CT-guided radiofrequency ablation of osteoid osteoma in the long bones of the lower extremity

Figure 1 Case 5: radiofrequency ablation for a 14-mm-diameter osteoid osteoma of the left femoral neck. A: A computed tomography (CT) image shows the medullary nidus surrounded by sclerosis (arrow); B, C: Axial (B) and coronal (C) CT images show the 10-mm cool-tip electrode at the center of the nidus. Ablation was performed only once. 4 mo after the procedure, the patient returned to our hospital due to recurrent pain. A second ablation was successfully performed.

Figure 2 Case 4: radiofrequency ablation for an 11-mm diameter Osteoid osteoma of the diaphysis of the left femur. A: A computed tomography (CT) image shows an ovoid lucent lesion with central mineralization (arrow); B, C: The radiofrequency ablation needle was placed at multiple positions.