Stomach and Intestine(Tokyo) Volume 54, Issue 6 (May 2019)

Endoscopic Diagnosis of Early Colorectal Cancer with NBI Magnification Shiro Oka 1 , Shinji Tanaka 2 , Kyoku Sumimoto 1 , Katsuaki Inagaki 1 , Yuki Okamoto 1 , Hidenori Tanaka 1 , Kenta Matsumoto 1 , Kazuki Boda 1 , Ken Yamashita 1 , Yuki Ninomiya 2 , Yasuhiko Kitadai 3 , Kazuaki Chayama 1 1Department of Gastroenterology and Metabolism Hiroshima University Hospital, Hiroshima, Japan 2Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan 3Department of Health Sciences, Prefectural University of Hiroshima, Hiroshima, Japan Keyword: JNET分類 , NBI , narrow band imaging , 隆起型 , 早期大腸癌 pp.859-869
Published Date 2019/5/25
  • Abstract
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 NBI(narrow band imaging)magnifying endoscopic classification of colorectal tumors has been proposed by the Japan NBI Expert Team(JNET). The JNET classification consists of four categories, including types 1, 2A, 2B, and 3, which are associated with the histopathological findings of hyperplastic polyp/sessile serrated polyp, low-grade intramucosal neoplasia, high-grade intramucosal neoplasia/shallow submucosal invasive carcinoma, and deep submucosal invasive carcinoma. According to the JNET classification, there is no significant difference in the diagnostic ability between protruded-type lesions and superficial lesions. In clinical practice, a majority of the protruded-type colorectal adenomatous lesions <10mm in size belong to Type 2A. There is no need to provide a diagnostic pattern for these lesions using chromo-agents. However, Type 2B showed various histologic findings, ranging from low-grade intramucosal neoplasia to deep submucosal invasive carcinoma. Therefore, additional examinations, such as a pit pattern diagnosis using chromo-agents, are necessary for accurate diagnosis of Type 2B lesions. It is also essential to consider a diagnostic strategy with NBI magnification in order to effectively use JNET classification in colonoscopy.

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54巻6号 (2019年5月)
電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院