Figure 2.

64-year-old male with metastatic colon cancer with prior RF ablation of a hepatic lesion presents with chronic pain from 4 right posterior chest wall masses involving the ribs, pleura, and adjacent musculature containing diffuse calcifications. Axial CT images (from left to right) demonstrate the total area of these 4 abutting masses to measure approximately 10 × 6.5 × 10 cm (a). A total of eight 2.4 mm cryoprobes were utilized during the procedure, with seven probes initially placed for the first freeze cycle, and an additional eighth probe was placed to cover the superficial/lateral tumor margin in the second freeze cycle ((b) and (c)). Up to 60 cc of saline were continuously injected to protect the overlying skin from the ablation zone. Final ice formation appeared to cover all tumor margins and measured 12 × 8 × 12 cm (d).