Pediatric Radiology > Abdominal > Neonatal > Hirschsprung Disease - Radiographic Features
Hirschsprung Disease - Radiographic Features
The transition zone is in the mid-descending colon.
the rectum is larger than the colon. In Hirschsprung
Disease, there is an abnormal rectosigmoid ratio with the rectum
smaller than the sigmoid due to denervation hyperspasticity.
Therefore, one see dilation of large and small bowel proximal to the "transition zone."
The "Transition Zone" is the junction between the proximal normally innervated colon and the distal aganglionic segment. The normally innervated proximal colon becomes dilated.
In 33% of cases, there is a normal-appearing rectum.
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