title: Demonstration of choledocholithiasis by barium-contrast endoscopic retrograde cholangiography.
mesh_terms: D001466:Barium Sulfate; D002758:Cholangiography; D004724:Endoscopy; D042882:Gallstones / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D007457:Iodine Radioisotopes / Q000009:adverse effects; D008297:Male; D008875:Middle Aged
chemical_list: D007457:Iodine Radioisotopes; D001466:Barium Sulfate