Figure 2. Graph shows ablation zone volume according to the number of probes used. Only those 14 ablation zones that were achieved without the Pringle maneuver and did not fuse with previous ablation zones (12 with the percutaneous approach and two with the intraoperative approach) were included in this analysis to eliminate effects other than those caused by the multipolar RF ablation device. The size of the ablation zone increased with the number of probes used. n = number of ablation zones. Error bars indicate minimum and maximum values.