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There is a blind-ending, tubular structure with thick, contrast enhancing walls adjacent to and actually connected to the distal ileum. The structure is surrounded by stranding of intra-abdominal fat. Note the moderate dilatation of proximal small bowel secondary to the inflammatory process in the distal ileum.
In this sagittal series you can readily identify the normal appendix, which in this patient has a retrocaecal course.