Hyperplastic polyps are by far the most common histologic type, and they can vary in location, number, and size. Most are less than 2 cm. Although these polyps harbor no malignancy, they may be accompanied by atrophic gastritis, which predisposes the nonpolypoid mucosa to malignant transformation. Multiple hyperplastic polyps are found in Ménétrier disease. The histology of these polyps is different from that of colorectal polyps in that it shows submucosal edema and faveolar hyperplasia.
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