Table 5. Gastric lesions classification with narrow band imaging (40).

Morphology and diagnosis	A	B	Hp+ (H-pylori infection)	C
Mucosal pattern	Regular circular	Regular ridge/tubulovillous/ Light blue crest*	Regular	Irregular or absent white opaque substance on the surface**
Vascular pattern	Regular thin/peripheral (gastric body) or thick/central (gastric antrum) vessels	Regular	Regular with variable vascular density.	Irregular
Diagnosis	Normal	Intestinal metaplasia	H pylori infection	Dysplasia

*, “Light blue crest”, defined as fine, blue line on the crest of the epithelial surfaces or gyri, being highly specific for the diagnosis of intestinal metaplasia; **, “White opaque substance” above the mucosa can be associated with dysplasia and cancer.