Squamous metaplasia in colorectal polyps

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Abstract
Two cases of rectal polyps that showed foci of squamous metaplasia are reported. in one, the squamous metaplasia was observed in an area of intramucosal adenocarcinoma. This finding tends to reinforce the contention previously made by some authors that squamous metaplasia in colorectal polyps may represent the precursor of primary colorectal squamous cell carcinoma or colorectal adenocarcinoma with squamous components (adenoacanthoma or adenosquamous carcinoma).