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Figure 7b.   Systemic lupus erythematosus with mesenteric ischemia in a 20-year-old man. (a) Contrast-enhanced CT scan shows diffuse circumferential bowel wall thickening in the small intestine with the target sign and mesenteric vascular engorgement and haziness. (b) Contrast-enhanced CT scan obtained at a lower level shows concentric rectal wall thickening (white arrows) and bladder wall thickening (black arrows) due to lupus cystitis.