Table 1.
Stage 1 | Stage 2 | Stage 3 | |
Polyp number | 1-4 | 5-20 | >20 |
Polyp size (mm) | 1-4 | 5-10 | >10 |
Histology | Tubular | Tubulovillous | Villous |
Dysplasia | Low grade | Low grade | High grade |
Stage 0, 0 points; stage I, 1-4 points; stage II, 5-6 points; stage III, 7-8 points; stage IV, 9-12 points. Points are accumulated for polyps' number, size, histology and severity of dysplasia. Stage I (1-4 points) indicates mild disease, whereas stage III-IV (7-12 points) implies severe duodenal polyposis. Derived from reference [7].