Video 9 - Hiatus hernia.
From the following article
W.G. Paterson, Raj K. Goyal and Fortunée Irene Habib
GI Motility online (2006)
doi:10.1038/gimo20
Normally during a swallow, a portion of the stomach moves into the chest due to contraction of the esophageal longitudinal muscle. Failure of the portion of the gastric fundus to return to its intra-abdominal location is indicative of hiatal hernia.
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