Inflammation
segmental mural hyperenhancement (red arrows)
moderate to severe asymmetric wall thickening accentuated along the mesenteric border (blue arrows)
hyperintense signal on T2w and signs of restricted diffusion on b800 and respective ADC images (green arrows)
Stricture
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luminal narrowing/obstruction with signs of active inflammation and with upstream dilatation (blue arrowhead)
Ulceration
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small focal break in the intraluminal surface of the bowel wall (green arrowhead)
Pseudosacculation
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broad-based outpouchings usually along the anti-mesenteric border (red arrowhead)
Penetrating disease
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blind-ending sinus tracts in the distal ileum (orange arrow)
Mesenteric inflammation
signs of fibrofatty proliferation (“creeping fat”) consistent with an increased amount of mesenteric fat adjacent to the abnormal small bowel loops most prominent on the mesenteric border (orange arrowheads)
engorged vasa recta (“comb sign”)
Additional findings
cranially reverted mobile caecum (yellow arrowhead)
inflammatory changes of the terminal ileum (yellow arrow)
sacroiliitis with a bony bridge (purple arrowhead)