Table 1.

Acute diverticulitis staging classification

Stage	Hinchey	Neff	Ambrosetti
0		Diverticular wall thickening
1	Small or confined pericolic abscess	Localized pneumoperitoneum or local abscess	Uncomplicated acute diverticulitis
2	Pelvic abscess	Pelvic abscess	Complicated acute diverticulitis
3	Localized perforation	Distant abscess	Complicated chronic diverticulitis with fistula or stenosis
4	Free perforation	Other distant complications