The significance of gas or barium in the biliary tract.
D001464:Barium; D001659:Biliary Tract; D001660:Biliary Tract Diseases; D041981:Gastrointestinal Tract / Q000000981:diagnostic imaging*; D011859:Radiography
D001464:Barium
BILIARY TRACT/diseases; GASTROINTESTINAL SYSTEM/radiography