AXR supine (above left) shows dilation of the stomach and duodenum and a loop of proximal jejunum with a decompressed small bowel gas pattern distally. This is more clearly shown on the upper GI exam (above right). AXR left lateral decubitus (below) shows a triple bubble sign with a dilated duodenum in the middle of the image with a dilated stomach proximal to it and a dilated jejunum distal to it.
