The results of Cholangiography with Biligrafin in a series of 101 cases seen at the Dept. of Radiology YonseiMedical College are reported. In a number of cases, non-visualization of the gall bladder by an oral opaque mediumhas been followed by distinct visualization by Biligrafin. Hence, the oral method must be assumed to afford moreinformation regarding the function of the gall bladder than intravenous cholangiography with Biligrafin, whichdose not yield any data about the concentration power of the organ. Our findings suggest that failure to visualizethe gall bladder as the same time that successful visualization of the biliary ducts is achieved followinginjection of Biligrafin indicates severe changes of the gall bladder, cystic duct, or both, with mechanicalobstruction to the entrance of opaque medium. In 9 cases of intravenous cholangiography, ascaris densities weredetected which were further confirmed on operating table. And the upper G.I. series performed to these patientsrevealed ascaris density in the descending duodenal loop in their films.