Table 4.

Modified Hinchey Classification.

Stage	Modified Hinchey classification	CT findings
0	Mild clinical diverticulitis	Diverticulum ± colonic wall thickening
Ia	Confined pericolonic inflammation/phlegmon	Colonic wall thickening with pericolonic soft tissue changes
Ib	Pericolonic/mesocolic abscess	Ia changes + pericolonic/mesocolic abscess
II	Pelvic, distant intraabdominal or retroperitoneal abscess	Ia changes + distant abscess (generally deep in the pelvis or in interloop regions)
III	Generalized purulent peritonitis	Free gas associated with localized or generalized ascites and possible peritoneal wall thickening
IV	Generalized fecal peritonitis	Same findings as III