Video 1 - Classic achalasia.
From the following article
W.G. Paterson, Raj K. Goyal and Fortunée Irene Habib
GI Motility online (2006)
doi:10.1038/gimo20
In classic achalasia, the esophagus is dilated with poor contractions. The lower esophageal sphincter remains contracted producing a bird beak appearance. Achalasia must be differentiated from other cases of narrowing at the lower end of the esophagus, like carcinoma of the esophagogastric junction and peptic strictures with scleroderma.
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