Figure 6c. (a, b) Photomicrographs (original magnification, x200) of the same sections of lung adenocarcinoma stained with H-E (a) and NADH vital histochemical (b) stains show complete microwave thermocoagulation of all areas. (c, d) Photomicrographs (original magnification, x100) of sections from normal lung parenchyma, obtained for comparison after microwave ablation and stained with H-E (c) and NADH (d) stains, show complete thermocoagulation on the left two-thirds but viable tissue on the right third of the slides. The dark-blue area (viable cells) on the right third is more clearly seen on the NADH-stained slide (d).