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Endoscopic Study of Colonic Villous Tumors Kaori Hasegawa 1 , Kurato Yashiro 2 , Kou Nagasako 2 1Department of Pathology, Tokyo Women's Medical College 2The Institute of Gastroenterology, Tokyo Women's Medical College pp.1325-1333
Published Date 1986/12/25
DOI https://doi.org/10.11477/mf.1403110059

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  • Abstract
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 Six hundred and fifty-two polypectomized adenomas and early carcinomas were studied with respect to the proportion of three subtypes (tubular, villotubular and villous) of adenomas, rate of cancerization and their shape and size.

 Villous tumor was defined as the one that composed of more than 80% of villous gland. Fifteen tumors, 2% of all adenomas and early carcinomas, were classified in this category. Villous tumor was found in 2% of pedunculated and as many of sessile polyps. All but one villous tumors were located at the lower part of the large intestine (rectum and sigmoid colon).

 There were no villous polyps smaller than 1 cm in diameter. The proportion of villous polyps among adenomas increased with the size of polyps. Villous tumor was found with higher frequency in the following categories: 1) pedunculated polyp 2-3 cm in size, 2) sessile polyp larger than 4 cm in diameter.

 Eighty percent of villous tumors were malignant, the frequency of malignant change being the highest among the three subtypes. Thirty-three percent of villous tumors had submucosal invasion of carcinoma. This was again the highest among all subtypes of adenoma.

 Some villous tumors were identified endoscopically. Most smaller ones, especially pedunculated ones, however, showed no distinctive features and therefore it was impossible to differentiate them from other subtypes.


Copyright © 1986, 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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