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    Open Access

    A new classification of periampullary diverticulum: cannulation of papilla on the inner margins of the diverticulum (Type IIa) is more challenging

    Periampullary diverticulum (PAD) may make the performance of endoscopic retrograde cholangiopancreatography (ERCP) in patients with choledocholithiasis more difficult and may increase complication rates. The p...

    He-xian Shi, Yong-qiang Ye, Hai-wang Zhao, De-cai Kong… in BMC Gastroenterology (2023)

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