Table 3.

Features at cross-sectional imaging associated with active, inflammatory and chronic, fibrotic disease patterns^{7 12–17 50 52}

	Active, inflammatory	Chronic
Wall thickening >4 mm	+	+
Wall oedema*	+
Wall submucosal fat*		+
Increased wall enhancement	+ (marked, often stratified)	+ (mild)
Ulceration	+
Mesenteric vascular engorgement (comb sign)	+
Mesenteric oedema	+
Abnormally enhancing mesenteric nodes	+

^*MR is superior to CT for distinguishing between wall oedema and fat.