Table 1.

Modified CT scoring system.

	0	1	2	3
Wall thickness	3 mm≥	4–5 mm	6–7 mm	≥8 mm
Wall enhancement (compared to adjacent vessels)	Normal	Mild; minor increase, but less than vessels	Moderate; moderate increase but less than vessels	Severe; marked increase, similar to vessels
Enhancement pattern	Normal	§ Homogenous	¥ Mucosal	£ Layered
Lesion length	None	5 cm	5–15 cm	15 cm≤
Comb sign	No	Yes
None: no signs of active disease Mild: total scores ≤6 or no features with score 3 Moderate: total scores 7–10 or presence of any one feature ≥3 Severe: total scores ≥11 or presence of at least one complication including abscess, fistula or stenosis

^§ one-layered bowel wall with enhancement. ^¥ two-layered bowel wall with inner layer enhancement. ^£ three-layered bowel wall with inner and outer layer enhancements and hypo-enhancement of the middle layer.