Classification of the Japan Esophageal Society for Magnifying Endoscopy and the Depth of Tumor Invasion:Type R Vessels and Histopathological Features Miwako Arima 1 , Mika Tsunomiya 1 , Takako Yoshii 1 , Yoichi Tanaka 2 , Masafumi Kurozumi 3 , Ayataka Ishikawa 3 1Department of Gastroenterology, Saitama Cancer Center, Saitama, Japan 2Department of Gastroenterological Surgery, Saitama Cancer Center, Saitama, Japan 3Department of Pathology, Saitama Cancer Center, Saitama, Japan Keyword: 食道表在癌 , 拡大内視鏡診断 , Type R , 低分化型扁平上皮癌 , INFc pp.213-221
Published Date 2014/2/25
DOI https://doi.org/10.11477/mf.1403114075
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 To verify that“irregular small-caliber, reticular(Type R)vessels are found in poorly differentiated carcinomas(por SCC), miscellaneous carcinomas such as basal-cell carcinoma, adenosquamous cell carcinoma, and mucoepidermoid carcinoma, and INFc according to the Japan Esophageal Society classification for magnifying endoscopy, we reassessed the vascular images of lesions showing por SCC, INFc, and miscellaneous carcinomas, to reinvestigate the characteristics of Type R. Among 316 lesions of superficial esophageal cancer, 45 showed por SCC, miscellaneous carcinomas, and INFc patterns, and 16(35.6%)of these lesions showed blood vessels evaluated to be Type R. Type R vessels were characterized by low vascular density in pale regions, extremely fine, curly, reticular features, marked differences in vessel caliber, and no traces of loop structures.

 Histopathologically, lesions showing fine and scattered invasion were often associated with Type R vessels. Among lesions showing por SCC, INFc, and miscellaneous carcinomas, Type R vessels appeared to be associated with infiltrative lesions exposed(nearly exposed)on the superficial layer of the esophagus.

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