Hospitalized and following antibiotic therapy for pneumonia. Now has increasing abdominal pain and progressive watery diarrhea.
CT Abdomen and pelvis
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Grossly thickened colon wall and low-attenuation edematous submucosa with pericolonic stranding. All colonic segments are affected indicating this is a pancolitis.
The central loop of bowel just superior to the urinary bladder demonstrates the accordion sign.