Dysphagia to solids and liquids, with food residue found in the esophagus during upper endoscopy.
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Diffuse esophageal dilatation due to contrast delay at the lower esophageal sphincter, with smooth, short segment tapering resembling a bird's beak.
In supine position, esophageal dilatation and tertiary contractions can be appreciated.
The patient's history, upper endoscopy, and barium swallow findings point toward achalasia, a primary disorder of the both the lower esophageal sphincter and of esophageal motility. Manometry would be confirmatory.