The Usefulness of the Alpha-Retroflex Position in Biliary Cannulation on Single-Balloon Enteroscopy-Assisted Endoscopic Retrograde Cholangiopancreatography in Patients with Roux-en-Y Gastrectomy: A Retrospective Study

Figure 5

Creation of the J-retroflex position from the alpha-retroflex position. (a and b) Insufficient en face view of the papilla in alpha-retroflex position (A-position). (c and d) Fluoroscopic and endoscopic view during counterclockwise rotation and leftward angulation of the balloon enteroscope, with the flexible part of scope used as the fulcrum of rotation. (e and f) Fluoroscopic and endoscopic view in the J-retroflex position created from the A-position.

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