Colorectal Serrated Adenomas: Endoscopic Findings Koichi Koizumi 1 , Mikio Yamanishi 1 , Akira Kazami 1 1Department of Internal Medicine, Cancer Institute Hosbital Keyword: serrated adenoma , 大腸ポリープ , 診断 pp.873-878
Published Date 1998/5/25
DOI https://doi.org/10.11477/mf.1403103728
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 Serrated adenoma is a distinct form of adenoma. It is characterized by a serrated epithelium resembling a metaplastic polyp. The present study shows the endoscopic findings in 64 colorectal serrated adenomas detected in 63 patients. 41 adenomas (64.1%) were located in the sigmoid colon and rectum. Twenty-one adenomas (32.8%) were in the right side colon. Sixteen of the serrated adenomas were pedunculated,22 were subpedunculated,16 were sessile, six were flat. The mean size of the adenomas was 9.2 mm (range 4~32 mm). Thirty-five adenomas (54.7%) were between 5 to 9 mm in diameter. Eight in 15 adenomas larger than 15 mm were the pedunculated polyp type. The adenomas tend to be reddish in color and to have a nodular surface, and especially to be larger in size.

 Eight adenomas (12.5%) had the component of intra-mucosal carcinoma. The mean size of the lesions was 13.9 mm (range 6~24 mm). There are serrated adenomas with both a metaplastic element and a carcinoma element. It suggest a metaplastic-adenoma-carcinoma sequence. Serrated adenoma should be removed endoscopically in the same manner as tubular adenomas.

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