Endoscopic sphincterotomy.
D014670:Ampulla of Vater / Q000601:surgery*; D001649:Bile Duct Diseases / Q000601:surgery; D002769:Cholelithiasis / Q000601:surgery*; D019723:Endoscopes; D004724:Endoscopy; D006801:Humans; D009803:Sphincter of Oddi / Q000601:surgery*