Table 4. Modified from Oyama et al.—criteria of the Japanese Endoscopic Society (JES) magnifying endoscopic classification (44).

Type of vessels	Scheme	Definitions	Invasion depth	Histology
A		Normal intrapapillary capillary loop pattern (IPCL) or abnormal micro vessels (7–10 µm) without severe irregularity	No invasion	Normal epithelium, inflammation, and low-grade intraepithelial neoplasia
B1		Abnormal micro vessels with severe irregularity or dilated abnormal (20 µm) vessels, Type B vessels with loop like formation	T1a-Epithelium, T1a-Lamina propria mucosa	High grade intraepithelial neoplasm or invasive squamous cell carcinoma
B2		Type B vessels with out a loop like formation	T1a-MM (muscularis mucous) or T1b-SM1 (submucosa)
B3		Highly dilated blood vessels (60 µm) with calibers >3 times B2 vessels	T1b-SM2 or deeper