For each of the types of colonic polyp listed on the left select the most appropriate association from those on the right

The answer is E, D, C. Tubular adenomas are usually small rounded nodules on a stalk. Tubulo-villous adenomas show a mixed histological pattern and are intermediate in size between tubular and villous adenomas. Villous adenomas are usually sessile, larger than 10 mm in diameter and have a large surface area; these are most likely to become malignant.

Invasion of the stalk of a polyp is an important criterion of malignancy (A) but is not invariably present. If the stalk has twisted glandular tissue may be trapped in the stalk giving rise to pseudoinvasion.

The juvenile polyp is a hamartomatous lesion of the mucosa (B).