Fig. 2. A non-relaxing lower esophageal sphincter “grips” an overtube (arrow) as it is being advanced into the stomach of a 38-year-old female with achalasia and sigmoid esophagus. As the semi-rigid overtube advances and straightens within the esophagus, the gastroesophageal junction can be seen invaginating into the stomach.

Korean J Gastroenterol 2023;82:190~193 https://doi.org/10.4166/kjg.2023.078

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