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A rare genetic intestinal disease with the presence of multiple (usually large) hyperplastic/serrated colorectal polyps, usually with a pancolonic distribution. Histology reveals hyperplastic polyps, sessile serrated adenomas (most common), traditional serrated adenomas or mixed polyps. It is associated with an increased personal and familial (first-degree relatives) risk of colorectal cancer. There is evidence this disease is caused by heterozygous mutation in the RNF43 gene on chromosome 17q22.
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