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Pathological Characteristics of Colorectal pm-Carcinoma Masakazu Yoshida 1 , Yoh Katoh 1 , Akio Yanagisawa 1 1Department of Pathology, cancer Institute Keyword: 大陽pm癌 , pm深達度の亜分類 , 腫瘤型pm癌 , “中間型”pm癌 , 潰瘍型pm癌 pp.1261-1267
Published Date 1992/11/25
DOI https://doi.org/10.11477/mf.1403110028
  • Abstract
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 Analyzing 152 operative cases of colorectal pmcarcinomas which were resected during the period of 14years from 1975 to 1988, we investigated pathological features of colorectal pm-carcinoma. We classified the lesions into two groups; pm-C (carcinomas invading the internal circular muscle) and pm-L (carcinomas invading the external longitudinal muscle). The number of the pm-C lesions were 75 (26 in the colon,49 in the rectum), and that of the pm-L lesions were 77 (26 colon, 54 rectum) respectively. The size of the pm-L lesons was in average 5-6mm larger than the pm-C lesons.

 Adenomatous component was found in 17.3% of the pm-C and 5.2% of the pm-L with a rather prominent villous variety in the pm-L. Concerning gross type of the tumor, incidence of the ulcerated type was significandy high in pm-L (more than 80% for both colonic and rectal carcinomas). However, when the ulcerated type was divided into“intermediate (Ⅰ)(shallowulcerated) type” or deep-ulcerated (U) type, I type was more frequent in the colonic pm-L (57.7%) than in the rectal pm-L (37.3%), suggesting a slightly different growth pattern of pm-carcinomas between in the colon and in the rectum. Further, the rate of lymph node metastasis was higher in the rectal pm-L (29.4%) than in any other pm-groups. This was probably due to a higher incidence of gross type U in the rectal pm-L. The growth pattern and biological behaviors of colorectal pm-carcinomas may be slightly different between the colon and the rectum.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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