What is the Difference Between Adenoma and Polyp?

The main difference between an adenoma and a polyp lies in their composition and potential to become cancerous. Here are the key differences:

• Adenoma: An adenoma, also known as an adenomatous polyp, is a type of polyp made up of tissue that resembles the normal inner lining of the colon or rectum but is different in some important ways when looked at under a microscope. Adenomas are gland-like growths that develop on the mucous membrane lining the large intestine. They are considered pre-cancerous because they have the potential to turn into cancer, specifically adenocarcinomas. There are different types of adenomas, including tubular adenomas, which protrude into the lumen of the colon, and villous adenomas, which are sometimes flat and spreading and are more likely to become cancerous.
• Polyp: A polyp is a growth on the lining of the colon or rectum. Polyps can be classified into different types, including adenomas (adenomatous polyps) and hyperplastic polyps. Hyperplastic polyps are typically benign and not a cause for concern, while adenomas have a higher potential to become cancerous. Polyps can grow in two different shapes: flat (sessile) and with a stalk (pedunculated).

In summary, adenomas are a specific type of polyp that have the potential to become cancerous, while polyps are more general growths on the lining of the colon or rectum that can be benign or pre-cancerous.

Comparative Table: Adenoma vs Polyp

Here is a table comparing the differences between adenomas and polyps:

Adenomas and polyps are both abnormal growths in the body, but adenomas have a higher probability of turning into cancer compared to polyps. Adenomas are classified as tubular, villous, and tubulovillous, while polyps are mainly classified into five types: adenomatous, hyperplastic, serrated, and inflammatory. Adenomas grow along glandular organs and mucous membranes, whereas polyps grow mostly on mucous membranes. Adenomas appear as thick, round-shaped bumps, while polyps appear as small, flat bumps.