Table 5 Spigelman classification for duodenal polyposis in familial adenomatous polyposis
Criterion1 point2 points3 points
Polyp number1–45–20>20
Polyp size (mm)1–45–10>10
HistologyTubularTubulovillousVillous
DysplasiaMild*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.

  • *A low degree of dysplasia according to current classification.

  • †A high degree of dysplasia.