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The sub‐classification of type B2 vessels according to the magnifying endoscopic classification of the Japan Esophageal Society

Guidelines for magnified endoscopic diagnosis of esophageal squamous cell carcinoma (SCC) have been proposed by the Japan Esophageal Society. Type B1, B2, and B3 reflect increasing tumor invasion depths (within mucosal epithelium or into lamina propria mucosa [T1a‐EP/LPM], into muscularis mucosa or superficial invasion into submucosa [T1a‐MM/T1b‐SM1], and into submucosa [T1b‐SM2], respectively). The diagnostic accuracy of type B1 and B3 is high, but accuracy of type B2 is low. We aimed to improve the diagnostic accuracy of type B2.