Abstract Introduction: Endoscopic retrograde cholangiopancreatog-raphy (ERCP) in patients with Billroth II gastrectomy is still a challenging procedure. The optimal approach, namely the type of endoscope and sphincter management, has yet to be defined. Aim : To compare the efficacy and safety of forward-viewing gastroscope and the side-viewing duodenoscope in ERCP of patients with Billroth II gastrectomy. Metho...