Oesophageal reflux. Frontal (left) and oblique (right) X-rays of the chest and upper abdomen of a 10-month-old infant with oesophageal reflux. The arrow at left points to the cardia, the region where the contents of the oesophagus empties into the stomach (across bottom). A contrast medium (white) shows the outline of the stomach and the oesophagus. Gastroesophageal reflux is where the contents of the stomach (including stomach acid) rise upwards into the oesophagus.