Table 1.

Revised CT classification

Classification	CT performed with IV-contrast and water-soluble rectal contrast
1.	Uncomplicated acute diverticulitis
	Site: proximal or distal descending colon/proximal or distal sigmoid
	Length of inflammation (cm)
	Maximal thickness (cm)
	Inflammation of pericolic fat (phlegmon)
2.	Complicated acute diverticulitis (classification 1 + one or more of the following findings)
	Abscess(es): mesocolic/pelvic/abdominal (maximum diameter in cm)
	Contrast extravasation: mesocolic/peritoneal
	Free air: mesocolic/pericolic/at distance (maximum diameter in cm)
	Free fluid: mesocolic/peritoneal (volume in mL)
3.	Complicated chronic diverticulitis
	Fistula
	Stenosis

Abbreviation: CT, computed tomography.