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Fig. 6. —Radiofrequency ablation for pain control. This 88-year-old woman with 15-cm primary bronchogenic carcinoma was having intense chest wall pain from growth of tumor into soft tissues. On prone CT scan, radiofrequency probe (arrows) is in peripheral portion of tumor where there has been direct extension into chest wall. Four radiofrequency applications were performed in this session. Note gas (arrowhead) in tumor, indicating necrosis. Patient's pain went from 10 to 3 (on a scale of 10) within 1 week.