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Endoscopic study of colonic villous tumors



Endoscopic study of colonic villous tumors



Stomach & Intestine (Tokyo) 21(12): 1325-1333



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 asmany of sessile polyps. All but one villous tumors were located at the lower part of the large intestine (rectum and sigmoid colon). There was no villous polyps smaller than 1 cm in diameter. The rpoportion 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 villour 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.

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Accession: 005359638

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