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


An adenoma whose cells are arranged in tubules. Tubules may vary in size and often occur singly.

Tubular adenomas of the region of the ampulla of Vater are usually smaller than villous or tubulovillous adenomas and have a polypoid growth pattern

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Perzin KH, Bridge MF (1981)
Adenomas of the small intestine: a clinicopathologic review of 51 cases and a study of their relationship to carcinoma.
Cancer 48: 799-819

. They consist of tubular glands resembling the basal portions of the intestinal crypts
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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