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A Pathological Study of Early Colorectal Carcinoma Tadakazu Shimoda 1 , Masahiro Ikegami 1 , Hougen Tei 1 , Eisei Ishikawa 1 1Department of Pathology, The Jikei University, School of Medicine pp.967-976
Published Date 1987/8/25
DOI https://doi.org/10.11477/mf.1403113026
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 The growth mode of early colorectal cancer was classified into two types (Fig. 1). The first type is intramucosal polypoid growth and the second non-polypoid intramucosal growth which shows mainly submucosal massive infiltration of carcinoma, Polypoid growth type was observed in 114 out of 132 (86.4%) lesions with a mean size being 17.9 mm in diameter. In this group, 59 showed pedunculated lesions suggesting an adenoma-cancer sequence except for two cases. These cases had a low incidence (10.2%) of submucosal infiltration, and furthermore, most of the cases had a minute or scattered invasion into the submucosa. Another polypoid lesion (mean size 20.5 mm) had a broad base and a high frequency of adenoma-cancer sequence (89.1%). Submucosal invasion in these lesions was mild. Intramucosal non-polypoid early colorectal carcinomas were seen in 18 lesions out of 132 (13.6%). This type of early carcinoma was smaller (10.7 mm in diameter) than the polypoid type. All such cases were shown to have massive invasion with a high frequency of intralymphatic and venous invasions (72.2%) in the submucosal layer. Non-polypoid type was not associated with adenoma.

 This type of cancer probably developed from de novo carcinoma of less than 10 mm in size. It is of special interest that almost all cases of advanced colorectal carcinomas were of the non-polypoid type.


Copyright © 1987, 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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