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Characteristics of Endoscopic Features of Proper Muscle (pm) Colorectal Cancer Masahiro Igarashi 1 , Tomoe Katsumata 1 , Yoshitaka Naito 1 , Kiyonori Kobayashi 1 , Katsunori Saigenji 1 1Department of Gastroenterology, Kitasato University East Hospital Keyword: 大腸pm癌 , 内視鏡診断 , sm癌との鑑別 pp.1283-1291
Published Date 1992/11/25
DOI https://doi.org/10.11477/mf.1403110031

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  • Abstract
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 We encountered 56 cases (male: 24 cases, female: 32 cases) of pm colorectal cancers detected in surgically resected specimens and by endoscopic observation during the last 12 years. Endoscopic characteristics of these cancers were as follows: 1) The frequency of pm cancer was 5.2% in a total of 1,084 colorectal cancers.

2) The distribution rate of pm cancer in the rectum and sigmoid colon (85.7%) was higher than that of early (76.2%) or other advanced (65.9%) colorectal carcinomas.

3) The average (±SD) maximal diameter of pm cancer was 34.4±12.2mm, which was significantly higher than that of sm cancer (18.3±9.2mm) and less than ss (a1) cancer (51.3±15.1mm).

4) The pm cancers studied were macroscopically classified into six groups as follows; protruded type (9 cases), plate type (5 cases), plate with depression type (18 cases), plate with ulcer type (8 cases), ulcer type (2 cases) and unclassified type (2 cases).

5) Tumors with depression or ulceration were observed more frequently in pm cancers (86%) than in sm cancers (14%), and the ratio of depressed or ulcerative area per tumor area was 21.5±15.6% in pm cancers, which was smaller than that found in other adwanced cancers (39.7±12.8%).

It is concluded that, endoscopically, pm cancer has characteristics somewhere between those of sm and ss (a1) cancers. To diagnose a pm cancer by usual endoscopic examination, it is important to observe the size and area of the depression or ulceration of the tumor.


Copyright © 1992, 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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