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In patients with Roux-en-Y (R-Y) anastomosis (including hepaticojejunostomy and R-Y gastric bypass) and Whipple operation, endoscopic retrograde cholangiopancreatography (ERCP) can be challenging. We retrospective analyses our experience with ERCP using balloon-assisted enteroscopy (BAE) (BAE-ERCP) in patients with R-Y anastomosis and Whipple operation.ERCP was performed in 15 patients (4 pancreaticoduodenectomy and 10cholangiojejunostomy and 1 Subtotal gastrectomy with R-Y reconstruction; age ranging from 4 to 63 years) with BAE. Doub