Page created on September 9, 2021. Not updated since.
Signs without contrast
| Sign | Description | Condition |
| Pneumoperitoneum | Air under the diaphragm | Air inside the abdominal cavity, usually due to bowel or ulcer perforation |
| Air-fluid levels | Horizontal air-fluid levels in the small or large intestine | Ileus |
| Pneumobilia | Air inside the biliary tree | Biliary-enteric fistula |
| Coffee bean sign | Dilated loop of twisted bowel which resembles coffee bean | Sigmoid volvulus |
| Pneumoatosis intestinalis | Air inside the intestinal wall | Necrotising enterocolitis (premature infants) |
Signs with contrast
| Sign | Contrast | Description | Condition |
| – | Barium and air enema | Outpouchings of the colonic wall | Diverticulosis |
| Apple-core sign | Barium and air enema | Apple core-like lesion | Colon cancer |