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Defintion of difficult colon polyp
| Shape (morphology) | Flat or hard to see |
| Sessile > 15 mm | |
| Carpet shaped (laterally spreading tumor) | |
| Villous or granular | |
| Irregular surface, irregular pit pattern, villous or granular | |
| If pedunculated, thick or short pedicle | |
| Size | < 1.5 cm |
| Large > 3 cm | |
| Big head | |
| Number | Multiple (> 3) |
| Location | Right colon and cecum |
| Ileoceccal valve | |
| Appendix orifice | |
| On top or behind of folds | |
| Difficult endoscopic position |
