Colon tumor
Polyps
Villous adenoma of colon

Author: Charanjeet Singh, M.D. (see Authors page)

Revised: 20 December 2016, last major update August 2011

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed Search: Villous adenoma [title] colon

Cite this page: Villous adenoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/colontumorvillousadenoma.html. Accessed January 19th, 2017.
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

Images hosted on other servers:

Villous adenoma

Adenocarcinoma arising in villous adenoma

Micro Description
  • Long fronds of papillary / villous projections arising directly from mucosal surface
Micro Images

Images hosted on other servers:

Various images

Villous adenoma