Laterally Spreading Tumor ; LST─Classification and Significance : the Diagnosis of Depth of Invasion in Laterally Spreading Tumor(LST)by Conventional Endoscopy Shin Hasegawa 1 , Osamu Tsuruta 2 , Hiroshi Kawano 1 , Keiko Arita 1 , Yasuhiko Maeyama 1 , Keiichi Mitsuyama 1 , Michio Sada 1 1Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan 2Department of Endoscopy, Kurume University School of Medicine, Kurume, Japan Keyword: 側方発育型大腸腫瘍 , LST , 顆粒型 , 非顆粒型 , SM深部浸潤癌 pp.959-968
Published Date 2010/5/25
DOI https://doi.org/10.11477/mf.1403101954
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 We retrospectively analyzed the epidemiological data of the laterally spreading tumor(LST), which was divided macroscopically into the following subtypes ; LST-G-H, LST-G-M, LST-NG-FE and LST-NG-PD, and investigated the relationship between the size of the tumor and the histopathological findings of these lesions, and investigated macroscopic findings of the invasive cancer.

 LST-G was more frequently located in the cecum and rectum than LST-NG, and the larger the size of the lesion, the higher the rate of early cancer in LST-G. On the other hand, LST-NG was smaller and located more frequently in the transverse colon than LST-G, and the rate of invasive cancer was higher than that of LST-G.

 According to our investigation of macroscopic findings of invasive cancer, lesions which have an elevation with swelling are highly indicative of invasive cancer, and are thus very important signs for diagnosis of invasive cancer.

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