|Adenomatous Polyp of the Colon
The Common Vein Copyright 2008
An adenomatous polyp on the other hand is a benign neoplastic proliferation of mucosal cells with multifactoroal causes including a diet, obesity, smoking and genetics and the resulting adenoma is a pathological process that has a propensity to evolve into a malignant lesion over 10-15 years. The lesion is diagnosed histologically after removal at colonoscopy, and is thus coincidentally treated. A follow up colonoscopy is recommended 3-5 years later.
Villous adenomas have a shaggy surface with papillary fronds and tend to be flatter lesions.
They have a greater propensity to become malignant. Invasive cancer is seen in about .5% of adenomas less than 1cms, 5% in the adenomas that range in size from 1-1.9cms, and in 10% that are greater than 2cms. One third of patients with have benign disease benign, one third have carcinoma in situ, and one third will demonstrate invasive carcinoma.