Prediction of colorectal tumor grade and invasion depth through narrow-band imaging scoring

Figure 2 Classification of surface patterns of colorectal tumors as revealed by narrow-band imaging. Colorectal lesions were broadly classified into tubular or papillary types, based on narrow-band imaging observations of histopathologic appearances and proliferation patterns; this was followed by an evaluation of the microstructure of the superficial layer of each lesion. Regarding the surface pattern, lesions with a clearly visualized surface microstructure were defined as the “clear type,” whereas lesions with a visualized but not readily discerned surface microstructure were defined as the “unclear type.” Lesions with a surface microstructure characterized by uniformly-sized pits in a regularly arranged pattern were defined as the “regular type,” whereas those with an irregular pit size and arrangement were defined as the “irregular type.” Representative images are shown. Magnification: 125 ×.