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 1

Cannulation strategy at our institution. S-position, straight scope position; J-position, J-retroflex scope position; A-position, alpha-retroflex position.