Comb sign

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Comb sign on contrast CT or MRI:

• Increased number of visible vessels on the mesenteric side of the affected segments of small bowel, which give the appearance of the teeth of a comb
  
• Found in Crohn's disease or lupus enteritis (SLE mesentric vasculitis)

References:
https://radiopaedia.org/articles/comb-sign
https://ojrd.biomedcentral.com/articles/10.1186/1750-1172-8-67