Which scope is appropriate for endoscopic retrograde cholangiopancreatography after Billroth II reconstruction: An esophagogastroduodenoscope or a colonoscope?

Figure 5 A case of treatment that was not successful by colonoscopy was successful by esophagogastroduodenoscopy. A: Cannulation to the papilla of Vater was not achieved because the papilla was difficult to observe in the front by colonoscopy; B: The papilla was observed in front by esophagogastroduodenoscopy, and cannulation was achieved; C: A common bile duct stricture caused by pancreatic cancer was observed by cholangiography; and D: A biliary stent was inserted.