Newborn who suffered a profound hypoxic event after being discharged home

AXR of bowel perforation
AXR AP (above) shows a large oval lucency in the midline of the upper abdomen. Cross table lateral AXR (below) shows a large amount of air between the abdominal wall and the liver. There is also air outlining both sides of the bowel wall of a loop of bowel (Rigler’s sign).

The diagnosis was pneumoperitoneum due to small bowel perforation due to bowel ischemia from the hypoxic event.