Pathological image shows a narrow caliber rectum and sigmoid colon (to the lower right) until a transition zone is encountered in the caliber of the colon (in the middle right) at which point the caliber of the colon is dilated all the way back to the hepatic flexure (upper left). The caliber of the ascending colon, appendix (middle left) and terminal ileum (lower left) are normal.
The diagnosis was Hirschsprung disease with a transition zone in the sigmoid colon.
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