Fig. 3. Once in position across a non-relaxing lower esophageal sphincter, an overtube (A) allows the safe passage of a duodenoscope for an endoscopic retrograde cholangiopancreatography (B, C). A retained common bile duct stone (arrow) is then removed using a stone-extraction balloon (arrowheads outline the ends of the balloon) (D).

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

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