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Gross morphology of 2 distinct regions observed. (A) Severely distended proximal colon (proximal dilation [PD]) was accompanied by a narrowed transition zone (TZ) located at the intersection of the dilated PD and distal non-dilated colon. (B) External luminal diameter of the PD was approximately 3 times larger than the TZ. **P < 0.01, ***P < 0.001.
