Fig. 10
From: Small bowel MR enterography: problem solving in Crohn’s disease
Example of comb sign in active inflammation: coronal True FISP image shows multiple linear low signal structures extending to the bowel wall in keeping with engorged vasa recta (arrows) supplying the thickened terminal ileum (asterisk). Note the fibrofatty proliferation within the adjacent mesentery, separating the inflamed terminal ileum from adjacent loops of bowel, with small mesenteric nodes also present