Kinda opposite to diverticulitis - mucosal protrusion into lumen. Solitary or multiple, pedunculated, sessile or flat, small or large, due to pathology deeper in bowel wall
- Neoplastic, hyperplastic, hamartomatous (Peutz-Jeghers), inflammatory or reactive
- Adenoma most common if neoplastic - 5% progress to cancer
- Present in 25-35% of population >50 y/o