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Histopathology of serrated colorectal neoplasias. A. Sessile serrated polyp/adenoma (SSA) with abnormal crypt architecture (flat-based crypt) (arrow). B. Mixed polyp with SSA (empty arrowhead) and non-serrated adenoma (empty arrow). C. traditional serrated adenoma with abundant eosinophilic cytoplasm of epithelial cells. D. Colorectal adenocarcinoma with serration (arrows).
