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Figure 4a. Transverse CT scans show large pneumothorax that formed after RF ablation in a 27-year-old woman with growing metastatic choriocarcinoma not responding to multiple sessions of systemic chemotherapy. (a) During RF ablation, a 17-gauge single electrode with 3.0-cm exposed tip was placed within the tumor, and treated areas of the tumor appeared as areas of hypoattenuation relative to residual tumor. (b) After RF ablation, a pneumothorax (arrows) occurred in the right pleural space, which was treated with thoracostomy tube insertion.
