Figure 1 - Timed barium swallow.
From the following article
Pathophysiology of achalasia and diffuse esophageal spasm
Ikuo Hirano
GI Motility online (2006)
doi:10.1038/gimo22
Following the ingestion of a fixed volume of barium, sequential radiographs are taken at 1, 2, and 5 minutes. The three panels demonstrate a lack of emptying with a fixed column of barium persisting at 5 minutes.
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