adenoma

• tubular adenoma
• villous adenoma
• tubulovillous adenoma

Serrated polyp

• hyperplastic polyp
• sessile serrated polyp
• traditional serrated polyp
• adenoma with serrated architecture
• conventional adenoma with serrated architecture
• unclassifiable serrated polyp with or without dysplasia

lymphoid nodule

Inflammatory

• inflammatory pseudopolyp
• inflammatory myoglandular polyp

mucosal prolapse

Other

• diverticular disease-associated polyp
• hamartoma
• endometriosis
• other neoplasm (see WHO neoplasms)