When examined under a microscope, colon polyps exhibit various morphological characteristics. Macroscopically, meaning when viewed with the naked eye, polyps are generally classified into three main forms:
* Pedunculated: Attached to the inner surface of the intestine by a thin stalk, resembling a mushroom.
* Sessile: Directly seated on the intestinal wall with a broad base.
* Flat: May be at the same level as the surrounding tissue or slightly raised.

Microscopically (histologically), the cellular and structural features of polyps vary. The most common microscopic appearances include:
* Tubular: Contain tube-shaped glandular structures.
* Villous: Exhibit finger-like or hair-like projections.
* Tubulovillous: Possess both tubular and villous components.
* Serrated: Show sawtooth-like indented epithelial structures.