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| Endoscopic appearance | Description | Paris classification |
|---|---|---|
| Protruded lesion | Sessile polyps | Is |
| Pedunculated polyps | Ip | |
| Subpedunculated polyps | Isp | |
| Flat lesion | Flat elevation | IIa |
| Completely flat | IIb | |
| Slight depression | IIc | |
| Flat elevation with central depression | IIa + IIc | |
| Central depression and raised edge | IIc + IIa | |
| Excavated lesion | Excavated/ulcerated | III |
