Surgical ampullectomy: A comprehensive review

Table 2 Spigelman’s classification of duodenal polyposis

Characteristics		Points
Number of polyps	1 to 4	1
	5 to 20	2
	> 20	3
Size of polyps	1 to 4 mm	1
	5 to 10 mm	2
	> 10 mm	3
Histological type	Tubular polyp, hyperplasia, inflammation	1
	Tubulovillous	2
	Villous	3
Dysplasia	Mild	1
	Moderate	2
	Severe	3

A total of 0 points = stage 0; 1 to 4 points = stage I; 5 to 6 points = stage II; 7 to 8 points = stage III; and 9 to 12 points = stage IV[55].