Barium enema in a 2-day old boy shows diffuse small caliber of the colon (arrows). Retained barium is noted in the stomach from a recent upper GI study (which was normal). Note the presence of air in the rest of the small bowel (tubular lucent areas in the background) indicating that this is a low intestinal obstruction.
- Pathology of colon itself: colonic atresia, diffuse Hirschsprung's disease
- Pathology of distal small bowel (no bowel content can pass into colon resulting in small colon caliber): ileal atresia, meconium ileus