A polyp is defined as a protuberance from a mucosal surface. Polyps can be found throughout the gastrointestinal tract, but are most common in the large intestine, followed by the stomach. A polyposis syndrome is a syndrome characterized by the presence of multiple polyps. Polyps can be classified according to their growth pattern as sessile (broad-based proliferations) or pedunculated. Polyps are more importantly classified according to the type of pathologic process that gives rise to them, which may be either inflammatory, hyperplastic, hamartomatous, neoplastic (adenomatous) or other.