Barium swallow showing the entire length of the esophagus with extreme narrowing of the esophago-gastric junction;There is dilatation, tortuosity, S-shaped bend in the lower oesophagus (sigmoid esophagus) There is a smooth narrowing at the lower end of the esophagus referred to as "bird-beak" appearance. The above appearance is very typical of achalasia of the cardia or cardiospasm.
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