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Indications for Endoscopic Submucosal Dissection of Colorectal Tumors Based on Clinicopathological Features Shiro Oka 1 , Shinji Tanaka 1 , Iwao Kaneko 2 , Ritsuo Mouri 2 , Toru Kawamura 2 , Mayuko Hirata 2 , Hiroyuki Kanao 2 , Tatsuma Fukuhara 2 , Kyoko Yoshioka 2 , Shigeto Yoshida 2 , Masaharu Yoshihara 3 , Kazuaki Chayama 2 1Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan 2Department of Gastroenterology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan 3Health Service Center, Hiroshima University, Higashihiroshima, Japan Keyword: ESD , 大腸腫瘍 , 適応 , 拡大観察 pp.1061-1072
Published Date 2007/6/25
DOI https://doi.org/10.11477/mf.1403101131
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 Although endoscopic submucosal dissection (ESD), a procedure excellent for en bloc resection of a large lesion, is being implemented for colorectal tumor, it has the disadvantage of involving a higher level of difficulty in implementation or a higher risk of perforation than is encountered in the stomach. In terms of size, in the colon and rectum ESD is generally indicated for tumors of20mm or larger in diameter that are difficult to remove en bloc by a snare. Most of such tomors are adenoma-based laterally spreading tumors (LST). In particular, LST-G can be diagnosed by magnifying observation of areas of suspected submucosal invasion or high grade cancer, and can be completely cured by planned piecemeal resection. However, it is difficult to diagnose the submucosal invasive area in LST-NG pseudodepressed type (PD) with magnifying observation.

 ESD is presently thought to be indicated for the colorectal tumors such as 1) LST-NG (particularly PD type) that is difficult to remove en bloc by a snare, lesions showing type V pit pattern, and submucosal cancers, 2) lesions with fibrosis due to biopsy etc., 3) local lesions due to chronic inflammation, and 4) residual early cancer with ulcer scar after endoscopic resection.

 Treatment strategies for choosing ESD or EMR should be discussed based on the clinicopathological characteristics of the LST subtype, the endoscopist's skill level and the patient's condition.


Copyright © 2007, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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