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A control image shows the NG tube within the upper oesophagus, which is distended and gas-filled. There is also gas within the stomach and bowel loops. This suggests a communication/fistula between the airways and the distal oesophagus.
On the second image, instillation of contrast via the NG tube fills the proximal oesophagus with no distal transit.
The third image shows the result of aspiration of barium from the distended oesophagus, opacifying the bronchial tree.