Signs in Imaging

Asymmetric smooth muscle atrophy and fibrosis of the inner circular layer of the tunica muscularis relative to the outer longitudinal layer probably account for the appearance of the hide-bound sign. Foreshortening of the bowel caused by longitudinal smooth muscle contraction results in packing of the valvulae conniventes, which is further accentuated by the associated dilatation of the affected loops.

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