Colon tumor
Polyps
Villous adenoma of colon


Topic Completed: 1 August 2011

Revised: 11 June 2019

Copyright: 2003-2019, PathologyOutlines.com, Inc.

PubMed Search: Villous adenoma [title] colon


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Cite this page: Singh C. Villous adenoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/colontumorvillousadenoma.html. Accessed July 22nd, 2019.
Clinical features
  • Older adults, commonly in rectum or rectosigmoid
  • Less frequent than tubular adenoma (eMedicine)
  • May invade directly into colon wall since no stalk is present to serve as buffer zone
  • Higher risk of malignancy than tubular adenoma; 40% risk if sessile and > 4 cm
Case reports
Treatment
  • Local excision if small
  • May need larger surgery to completely excise, even if benign
Gross description
  • Soft, usually large and sessile with papillary villous projections, large base and no stalk; may encircle the bowel
Gross images

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Villous adenoma

Adenocarcinoma arising in villous adenoma

Microscopic (histologic) description
  • Long fronds of papillary / villous projections arising directly from mucosal surface
Microscopic (histologic) images

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Various images

Villous adenoma

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