A study of colorectal early cancer.

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Moderate-sized polyps (adenoma and early cancer) ranged 6-5 mm in diameter were studied in order to evaluate the position and significance of early cancer. Among 337 polyps studied, adenoma was 239 and early cancer was 98 (29%) in number. Subdivision of early cancer was as follows: m cancer, 81 and sm cancer, 17 in number. A tendency that the larger their polyps the higher the ratio of lower-colon polyp was noticed. Early cancers existed at the rectum in the highest ratio, and the ratio of early cancer got lower at the right-sided colon. Polyps were divided into sessile and pedunculated according to their shape, the former accounted for one fifth (72 polyps) and the latter four fifths (265 polyps). Early cancer war 21% in sessile polyps and 31% in pedunculated polyps in all. In polyps larger than 1 cm the ratio of cancer cancer ratio was almost the same (ca 50%) among them. The number of m and sm cancer was almost the same in sessile polyp, while that of in cancer was 7 times larger than that of sm cancer in pedunculated polyps.
社団法人日本消化器内視鏡学会の論文