Standard vs magnifying narrow-band imaging endoscopy for diagnosis of Helicobacter pylori infection and gastric precancerous conditions

Figure 1 Normal and three abnormal mucosal patterns in the gastric corpus by standard endoscopy. A: Normal pattern, numerous minute red dots; B: Type A, mosaic-like appearance; C: Type B, diffuse homogenous redness; D: Type C, irregular redness with grooves.

Figure 2 Micromucosal patterns in the gastric corpus observed by magnifying narrow-band imaging endoscopy. A: Normal pattern characterized by regular arrangement of collecting venules and honeycomb-like subepithelial capillary network; B: Type Z-1, regular round pits with polygonal sulci; C: Type Z-2, more dilated and linear pits without sulci; D: Type Z-3, loss of gastric pits with coiled microvessels.