Figure 1. Barium swallow images demonstrating (a) severe reflux of barium on the supine lateral view with anterior displacement of the upper oesophagus (arrow) and an obliquely orientated impression (arrows) upon the upper thoracic oesophagus at the level of the 4th thoracic vertebra on (b) the anteroposterior (AP) and (c) right anterior oblique (RAO) views.