Lateral image from an enema shows that the rectum is narrower in diameter than the sigmoid colon. The recto-sigmoid ratio is < 1, thus there is recto-sigmoid inversion. The sigmoid colon is packed with stool. The diagnosis was Hirschsprung disease… Read on blog or Reader Pediatric Imaging Read on blog or Reader Infant with difficulty stooling Pediatric Imaging March 30 Lateral image from an enema shows that the rectum is narrower in diameter than the sigmoid colon. The recto-sigmoid ratio is < 1, thus there is recto-sigmoid inversion. The sigmoid colon is packed with stool. The diagnosis was Hirschsprung disease.

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