Table 1.

Modified Hinchey Classification of Acute Diverticulitis [modified from (9) and (26)]

Stage	Characteristics
0	Mild clinical diverticulitis (left lower quadrant abdominal pain, low-grade fever, leukocytosis, no imaging information)
1a	Confined pericolic inflammation, no abscess
1b	Confined pericolic abscess (abscess or phlegmon may be palpable; fever; severe, localized abdominal pain)
2a	Distant abscess amenable to percutaneous drainage
2b	Complex abscess associated with/without fistula
3	Generalized purulent peritonitis, no communication with bowel lumen
4	Feculent peritonitis, open communication with bowel lumen
Complications	Fistula, obstruction (large bowel or small bowel)