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 6

Schema of balloon enteroscope position. (a) Straight position (S-position). (b) J-retroflex position (J-position). (c) Alpha-retroflex position (A-position). The S-position provides a tangential view of the papilla, and the J-position provides an en face view. The A-position also provides an en face view of the papilla, although the scope tip is likely to be close to the papilla. S-position, straight scope position; J-position, J-retroflex position; A-position, alpha-retroflex position.

(a)

(b)

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