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A Case of Mixed Hyperplastic-adenomatous Rectal Polyp with Composition of Invasive Adenocarcinoma
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Hyo Rim Seo, Ji Hyun Kim, Soo Jin Jung, Yun Jung Choi, Choong Heon Ryu, Kwan Sik Park, Seoung In Ha, Eun Uk Jung, Sang Heon Lee, Sung Jae Park, Jung Sik Choi, Sam Ryong Jee, Youn Jae Lee, Sang Young Seol
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Intest Res 2012;10(3):295-299. Published online July 31, 2012
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DOI: https://doi.org/10.5217/ir.2012.10.3.295
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 Abstract
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- Epithelial colon polyps are largely divided into hyperplastic and adenomatous polyps. Adenomatous polyps are premalignant lesions, whereas hyperplastic polyps are regarded as benign lesions. However, this histological classification has been blurred, as cases of malignant changes in hyperplastic polyposis, mixed hyperplastic adenomatous polyps (MHAPs), and serrated adenomas in the colon have been reported. Rare cases of MHAP have been reported, and are mainly found at the proximal colon with a relatively large size. MHAPs seem to be an intermediate stage of the hyperplastic polyp-adenoma sequence or a collision tumor. Here, we report on a case of a single polyp in the rectum diagnosed with a MHAP combined with an invasive adenocarcinoma. (Intest Res 2012;10: 0-299)
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