Fig. 5
Traditional serrated adenoma. a–b The most typical feature of traditional serrated adenoma (b) is the distinctive type of serration (slit-like serration, arrow), reminiscent of the narrow slits in the normal small intestinal mucosa (a). Ectopic crypt foci (arrowhead) and columnar cells with prominent eosinophilic cytoplasm are also seen (b). c Large protuberant traditional serrated adenoma with villiform growth. d. A small protuberant traditional serrated adenoma with an identifiable adjacent precursor lesion. e Some traditional serrated adenomas are flat as in this example. Flat traditional serrated adenomas are often associated with a precursor sessile serrated polyp and located in the right colon. f Mucin-rich traditional serrated adenoma
