Figure 5: Gross pathologic appearance of microwave ablation. Ablated tissue is shown sectioned perpendicular to the applicator axis. At 150 W after 8 minutes of treatment, the in vivo (left) "white zone" coagulation diameter is 5.7 cm ± 0.2 (arrows), significantly larger than the corresponding ex vivo (right) diameter of 4.9 cm ± 0.2 (arrows).