CT images in a 37-year-old woman with Crohn disease (ileocolitis). (a) Transverse scan obtained following enteroclysis demonstrates ileoileal (arrow) and ileosigmoidal fistulae (arrowhead). The involved ileal and colonic wall is asymmetrically thickened. (b) Coronal reformation shows ileoileal fistula (arrow) quite well. Contrast enhancement in vagina (arrowheads) is due to an ileovaginal fistula. (Images courtesy of John Lappas, MD, University of Indiana.)

radiology.rsna.org/content/240/3/623.full

comb sign in crohn s disease

arrowheads=prominent vasa recta coursing through

proliferative mesenteric fat to supply inflamed thick

walled terminal ileum(arrowhead)

C=cecum.

Reference:BiblioMed Textbook-Computed Body Tomography

marked proliferation of fat within mesentery

surrounding ascending colon(A),pushing
small bowel to the left side.

arrow=mesenteric fat surrounding thickened

ascending colon.

arrowhead=terminal ileum is diffusely inflamed

and edematous producing mass effect on adjacent

dilated small bowel loops(s).