source: The Association of Paediatric Gastroenterology and Nutrition Nurses
The lining of the intestine is normally as smooth as the inside lining of your mouth. An outgrowth of tissue from the lining of the intestine is referred to as an intestinal polyp. Polyps may grow out of the lining of the small and / or large intestine or stomach. Most commonly, polyps are shaped like a mushroom, with a narrow stalk that connects the bulkier end to the intestinal wall. Other polyps are flatter and grow directly on the wall of the intestine. The size of polyps may vary from under 2 millimeters (less than 1/10 of an inch) to over 1 inch in diameter.