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WHO Classification of Tumours
Villous adenoma, NOS
Region of the ampulla of Vater


Definition

Villous adenomas are usually more sessile than tubular adenomas. The neoplastic cells in villous adenomas line variably long simple or branching papillae that are more exuberant than the normal villi of the duodenal mucosa. Villous adenomas are more likely to have high grade dysplasia or an associated invasive carcinoma than tubular adenomas
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Bosman FT, Carneiro F, Hruban RH, Theise ND (Eds.)
WHO Classification of Tumours of the Digestive System.
4th Edition
International Agency for Research on Cancer: Lyon 2010



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