Table 1.

Spigelman grading of duodenal adenomas in familial adenomatous polyposis.

Points	1	2	3
Number of polyps	1–4	5–20	>20
Polyp size	1–4	5–10	>10
Histology	Tubular	Tubulovillous	Villous
Dysplasia	Mild	Moderate	Severe

Stage 0 = 0 points; stage I = 1–4 points; stage II = 5–6 points; stage III = 7–8 points; stage IV = 9–12 points.