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. 2005 Jul;54(7):1034–1043. doi: 10.1136/gut.2004.053843

Table 2.

 Spigelman classification for duodenal polyposis in familial adenomatous polyposis

Criterion Points
1 2 3
Polyp number 1–4 5–20 >20
Polyp size (mm) 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.