Definition and Concept of Laterally Spreading Tumor(LST) Shiro Oka 1 , Shinji Tanaka 1 , Sayaka Oba 2 , Hiroyuki Kanao 2 , Shigeto Yoshida 1 , Kazuaki Chayama 2 1Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan 2Department of Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan Keyword: 側方発育型腫瘍 , laterally spreading tumor(LST) , 肉眼形態分類 pp.619-623
Published Date 2010/4/30
DOI https://doi.org/10.11477/mf.1403101911
  • Abstract
  • Look Inside
  • Reference
  • Cited by

 The term‘LST' was originally proposed by Kudo for the tumors which extend laterally larger than 10mm in size, including those not granular in shape. Recently, the definition of LST has been accepted not only in Japan but also in Western countries. LST are classified into two types according to their morphology, granular type(LST-G)and non-granular type(LST-NG). Each type has two subtypes. The former consists of a‘homogenous type' and a‘nodular mixed type', while the latter consists of a‘flat elevated type' and a‘pseudodepressed type'. The recognition and development of LST was established through several reports concerning their clinicopathological features. Also, it is clinically important to distinguish the macroscopic type by the classification of its development and progression.

Copyright © 2010, Igaku-Shoin Ltd. All rights reserved.


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