The diameter of the common bile duct determined by ultrasound and ERCP is not necessarily comparable.
D002760:Cholangiopancreatography, Endoscopic Retrograde; D002769:Cholelithiasis / Q000473:pathology; D002779:Cholestasis / Q000473:pathology; D003135:Common Bile Duct / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D006801:Humans; D011446:Prospective Studies; D014463:Ultrasonography