Table 5. NBI classification systems of Barrett’s esophagus.

Classification system	Manifestation
Amsterdam Classification	Mucosal pattern: regular (flat, villous/gyrus, other), irregular/disrupted
	Vascular pattern: regular, irregular, normal-appearing long branching vessels
Kansas Classification	Mucosal pattern: ridge/villous, circular, irregular/distorted
	Vascular pattern: normal (presence of thin vessels with a uniform branching pattern), abnormal (dilated, corkscrew vessels with increased vascularity and abnormal, non-uniform branching pattern)
Anagnostopoulos’ Classification	Mucosal pattern: regular microstructural pattern, irregular microstructural pattern, absent microstructural pattern
	Vascular pattern: regular microvascular pattern, irregular microvascular pattern
Barrett’s International NBI Group (BING) Criteria	Mucosal pattern: regular (circular, ridged/villous, tubular), absent, irregular
	Vascular pattern: regular (blood vessels situated regularly along or between mucosal ridges and/or those showing normal, long, branching patterns), irregular (focally or diffusely distributed vessels not following normal architecture of the mucosa)
Japan Esophageal Society Barrett’s esophagus (JES-BE) Classification	Mucosal pattern: invisible (flat), visible (pit, non-pit)
	Vascular pattern: invisible (flat), visible (net, non-net)
Nottingham Classification	Type A: round pits with regular microvasculature
	Type B: villous/ridge pits with regular microvasculature
	Type C: absent pits with regular microvasculature
	Type D: distorted pits with irregular microvasculature
Classification of Capillary and Pit Pattern (CP Classification)	Type I: uniform branches or vine-like pattern with a clear shape that can be traced smoothly
	Type II: coiled or spiral pattern with a nonuniform shape that cannot be traced sufficiently and with increased vascularity

NBI, narrow-band imaging.