Congenital Pyloric Stenois - Important Signs

1.  String sign: thin column of barium leaking through the tightened muscle
2. Shoulder sign: filling defect in the antrum due to prolapse of muscle inward
3.  Mushroom sign: hypertrophic pylorus against the duodenum
4. Railroad track sign: excess mucosa in the pyloric lumen resulting in 2 columns of barium.