Spigelman classification for duodenal polyposis in familial adenomatous polyposis
| Criterion | Points | ||
|---|---|---|---|
| 1 | 2 | 3 | |
| Stage 0, 0 points; stage I, 1–4 points; stage II, 5–6 points; stage III, 7–8 points; stage IV, 9–12 points. | |||
| Polyp number | 1–4 | 5–20 | >20 |
| Polyp size (mm) | 1–4 | 5–10 | >10 |
| Histology | Tubular | Tubulovillous | Villous |
| Dysplasia | Mild | Moderate | Severe |