Table 1 Hinchey classification and modified Hinchey classification of acute diverticulitis [10, 12]

0 Mild clinical diverticulitis

I Pericolic abscess or phlegmon

1a Colonic wall thickening/Confined pericoloc inflammation

Ib Confined small (< 5 cm) pericolic abscess

II Pelvic, intraabdominal, or retroperitoneal abscess

II Pelvic, distant intraabdominal, or retroperitoneal abscess

III Generalized purulent peritonitis

III Generalized purulent peritonitis

IV Generalized fecal peritonitis

IV Fecal peritonitis