colorectal villous adenoma

 Colorectal Villous Adenomas

Approximately 20% of a symptomatic persons screened by colonoscopy have villous adenomas, a third of which contain high-grade dysplasia.

Slightly <2% contain invasive carcinoma.

Villous adenomas consist of elongated finger-like non-branching fronds of dysplastic epithelium extending outward from the muscularis mucosae to the colonic lumen.

The villi contain cores oflamina propria covered by a single layer of adenomatous epithelium

It has been defined that villous lesions as those that contain
> 80% of a villous component.

See also

 colorectal adenomas

• colorectal tubular adenoma