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Histomicrographs of serrated polyps. A, Hyperplastic polyp (microvesicular subtype) with serrations in the upper half of the crypt and no cytologic dysplasia. B, Sessile serrated adenoma/polyp (SSA/P) with characteristic branching crypt bases (arrow). C, SSA/P with dysplasia: arrow indicates dysplastic epithelium with hyperchromatic nuclei and pseudostratification. D, Traditional serrated adenoma showing ectopic crypt (arrow and circle).
