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Fig. 3B. —Two protective maneuvers for radiofrequency ablation of thoracic lesions are creation of posterior hydroma in 73-year-old-man with severe emphysema and primary lung carcinoma to avoid lung parenchyma, and instillation of cool saline into endotracheal tube cuff to protect trachea from heat of radiofrequency ablation. Two 22-gauge needles have been inserted into extrapleural tissues for instillation of 75 mL of distilled sterile water. Extrapleural tissues have been widened (arrows). Note scar in left lung adjacent to major fissure.