抄録
Lung cancer is the leading cause of cancer death all over the world, and metastatic lung cancer is also the cause of death in many patients with malignancies. The first-line treatment is surgical resection, but fewer than 30% of the patients are surgical candidates. Lung radiofrequency ablation (RFA) can be an alternative treatment, and the number of patients undergoing RFA will increase. Therefore, we should be well aware of the imaging findings after lung RFA. Immediately after RFA, ground-glass opacity with thin rim appears around the tumor. It changes to dense consolidation with non-contrast enhancement 1-3 months after wards. At this time, the diameter of the consolidation can be larger than the baseline tumor diameter. It decreases in size gradually and can be the same or smaller compared to the baseline tumor size at approximately 6 months after wards. If the size of the ablation zone does not become smaller, a contrast enhanced nodule appears around the ablation zone, or high FDG uptake can be seen adjacent to the ablation zone, it should be diagnosed as residual or recurrent tumor. Most frequent complication is the pneumothorax. Other complications including air-embolism, interstitial pneumonia, pulmonary artery pseudoaneurysm, bronchopulmonary fistula and tumor seeding can also be seen.
