Staging the duodenum and ampulla and recommended OGD surveillance intervals
| Points allocated | |||
| 1 | 2 | 3 | |
| Number of polyps | 1–4 | 5–20 | >20 |
| Polyp size (mm) | 1–4 | 5–10 | >10 |
| Histological type | Tubular | Tubulovillous | Villous |
| Degree of dysplasia | Mild | Moderate | Severe |
OGD, oesophago-gastro-duodenoscopy.