Percutaneous transhepatic cholangiography (P.T.C) is a most valuable procedure indifferentiation of obstruction jaundice, where benigh (chiefly stone) or malignant condition. Authers present the dlinical and P.T, C findings of 30 cases of obstructive jaundice which were experienced from December 1975 to May 1997, at department of Raidiology, Kyung-pook National University Hospital. The summerized results were as follows. 1. The incidence of malignancy beyond the age of 40 was high compared with stone, which revealed relatively equal age distribution. 2. The stone showed as concave cupping in all cases (11 cases), but the malignancy showed as nipple formation (10 cases) and irregular narrowings (9 cases). 3. The dilaton of the intrahepatic bile duct appeared 10 cases on malignance among 19 cases of malignancy (52.6%) and 4 cases on stone which were multiple intrahepatic or common hepatic duct stones. 4. The dilation of the justproximal bile duct was severe on malignancy comp red with stone. 5. The mean bilirubin level was high on malignancy (12.8mg%) compared with stone. (10.3mg%)