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Figure 9a.  Recurrent synovial sarcoma of the pleura in a 47-year-old woman. A 9-cm mass developed in the right pulmonary apex after surgery and radiation therapy. RF ablation was performed with a cool-tip cluster RF ablation probe. (a, b) CT scans show that multiple placements of the probe were required to thermocoagulate the mass. (c) Sagittal gadolinium-enhanced MR image obtained after RF ablation shows extensive central thermocoagulation of the tumor, which demonstrates a thin rim of enhancement. Residual tumor tissue extends between the ribs.