Kyoto classification of gastritis, virtual chromoendoscopy and artificial intelligence: Where are we going? What do we need?

Table 1 The endoscopic findings of the Kyoto classification of gastritis

Kyoto classification
Related to gastric cancer risk	Mucosal atrophy
	Intestinal metaplasia
	Enlarged folds
	Nodularity
Related to Helicobacter pylori infection status	Diffuse redness
Others	Regular arrangement of collecting venules
	Map like redness
	Foveolar hyperplastic polyp
	Xanthoma
	Mucosal swelling
	Patchy redness
	Depressed erosion
	Sticky mucus
	Hematin
	Red streak
	Spotty redncess
	Multiple white and flat elevated lesions
	Fundic gland polyp
	Raised erosion

Table 2 The Kyoto classification score

Endoscopic finding	Score
Mucosal atrophy	0	None	C0-CI according to Kimura Takemoto classification
	1	Mild	CII-CIII
	2	Severe	OI-OIII
Intestinal metaplasia	0	None	None
	1	Mild	Within the antrum
	2	Severe	Up to the corpus
Enlarged folds	0	Negative	< 5 mm gastric fold width
	1	Positive	≥ 5 mm gastric fold width
Nodularity	0	Negative	None
	1	Positive	Small nodules in the antrum
Diffuse redness	0	None	None
	1	Mild	Mild translucency of collecting venules in the body
	2	Severe	Severe translucency of collecting venules in the body

A score of 0 indicates no Helicobacter pylori (H. pylori) infection, a score of ≥ 2 indicates current H. pylori infection, and a score of ≥ 4 indicates higher risk of gastric cancer risk.