A broad-based polyp with a villous surface is usually a polyp that is more closely associated with the intestinal wall and has a rough, villous surface. Broad-based polyps usually grow against the intestinal wall and have a high rate of malignancy. Broad-based polyps can also be categorized into broad-based pedunculated polyps and broad-based non-pedunculated polyps. The former is more likely to become cancerous. If the surface of the intestinal polyp villous changes belong to the villous tubular adenoma is a kind of colorectal polyps, usually rare, large size, such polyps are also prone to malignant transformation, its form is rough, the surface is dark red, in the form of villous protrusion. Wide base polyp surface chorionic changes usually indicate that patients with polyps with a high rate of malignant transformation, patients should be examined and diagnosed early under the guidance of the doctor for surgical resection treatment.