PTC is the single most valuable diagnostic method available to evaluate the size, shape and site of the causes of obstructive jaundice among various radiological procedures. The authors reviewed and radiologically classifield the PTCfilms of 203 cases of obstructive jaundice from July 1977 to June 1983 at Presbyterian Medical Center, Jeon-ju confirmed clinically, operatively and pathologically. The results are as follows ; 1. The most common cause of obstructive jaundice was bile duct stone (64/203 : 31.53%) and the other causes were bile duct cancer (34/203 : 21.18%), pancreas cancer (41/203 : 20.19%), biliary ascariasis &/or clonorchiasis (20/203 : 9.85%), ampulla and duodenal cancer (7/203 : 3.45%), fibrotic stenosis of sphincter of Oddi (6/203 : 2.96%) etc. in that order. Of these primary involvement with cancer was more frequent (91/203 : 44.33%) than stone. 2. 88.33% (179/203) of patients was over 40-year-of-age and the sex ratio between male and female stenosis by stone or by cancers was nearly equal (2.36Cm : 2.38Cm). 4. Cancers caused complete bile duct obstruction in about 75% (68/91) of cases and also were associated with intrahepatic duct dilatation about 92% (84/91) of cases. But in contrast biliary calculi showed good drainage of contrast medium in 75% (48/64) of cases and 92% (59/64) showed normal diameter of intrahepatic duct. 5. The differential PTC findings between bile duct cnacer and pancreas cancer were not so distinct but in bile duct cance the obstruction site of the bile duct was more irregular and serrated than pancreas cancer, while the latter showed a more downward convexity and a smoother end. Moreover annular filling defect with overhanging edges was seen only in bile duct cancer.