Cutting the sphincter in the presence of a normal cholangiogram.
D002760:Cholangiopancreatography, Endoscopic Retrograde; D002761:Cholangitis; D042882:Gallstones / Q000175:diagnosis* / Q000601:surgery*; D006801:Humans; D012008:Recurrence; D016717:Sphincterotomy, Endoscopic