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Review
. 2016 Jul;28(5):526-33.
doi: 10.1111/den.12644. Epub 2016 Apr 20.

Narrow-band imaging (NBI) magnifying endoscopic classification of colorectal tumors proposed by the Japan NBI Expert Team

Yasushi Sano  1 , Shinji Tanaka  2 , Shin-Ei Kudo  3 , Shoichi Saito  4 , Takahisa Matsuda  5 , Yoshiki Wada  6 , Takahiro Fujii  7 , Hiroaki Ikematsu  8 , Toshio Uraoka  9 , Nozomu Kobayashi  10 , Hisashi Nakamura  11 , Kinichi Hotta  12 , Takahiro Horimatsu  13 , Naoto Sakamoto  14 , Kuang-I Fu  15 , Osamu Tsuruta  16 , Hiroshi Kawano  17 , Hiroshi Kashida  18 , Yoji Takeuchi  19 , Hirohisa Machida  20 , Toshihiro Kusaka  21 , Naohisa Yoshida  22 , Ichiro Hirata  23 , Takeshi Terai  24 , Hiro-O Yamano  25 , Kazuhiro Kaneko  8 , Takeshi Nakajima  5 , Taku Sakamoto  5 , Yuichiro Yamaguchi  26 , Naoto Tamai  4 , Naoko Nakano  23 , Nana Hayashi  2 , Shiro Oka  2 , Mineo Iwatate  1 , Hideki Ishikawa  22 , Yoshitaka Murakami  27 , Shigeaki Yoshida  28 , Yutaka Saito  5
Affiliations
Review

Narrow-band imaging (NBI) magnifying endoscopic classification of colorectal tumors proposed by the Japan NBI Expert Team

Yasushi Sano et al. Dig Endosc. 2016 Jul.

Abstract

Many clinical studies on narrow-band imaging (NBI) magnifying endoscopy classifications advocated so far in Japan (Sano, Hiroshima, Showa, and Jikei classifications) have reported the usefulness of NBI magnifying endoscopy for qualitative and quantitative diagnosis of colorectal lesions. However, discussions at professional meetings have raised issues such as: (i) the presence of multiple terms for the same or similar findings; (ii) the necessity of including surface patterns in magnifying endoscopic classifications; and (iii) differences in the NBI findings in elevated and superficial lesions. To resolve these problems, the Japan NBI Expert Team (JNET) was constituted with the aim of establishing a universal NBI magnifying endoscopic classification for colorectal tumors (JNET classification) in 2011. Consensus was reached on this classification using the modified Delphi method, and this classification was proposed in June 2014. The JNET classification consists of four categories of vessel and surface pattern (i.e. Types 1, 2A, 2B, and 3). Types 1, 2A, 2B, and 3 are correlated with the histopathological findings of hyperplastic polyp/sessile serrated polyp (SSP), low-grade intramucosal neoplasia, high-grade intramucosal neoplasia/shallow submucosal invasive cancer, and deep submucosal invasive cancer, respectively.

Keywords: classification; colorectal neoplasms; magnifying endoscopy; narrow band imaging; the Japan NBI expert team (JNET).

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