Potentiated intravenous cholangiotomography by infusion of 40 cc. of ioglycamide, bilivistan, or 50 cc. of iodipamide, in 250 cc. of 5 per cent glucose solution, infuseed in 60 minutes, results in a very satisfactory visualization of the extrabiliary system. There is simultaneous opacification of the gallbladder and ducts, with minimal or no side-effects and minimal renal excretion of the contrast medium.