The authors analyzed computerd tomographic and ultrasonographic findings of 36 cases of gallbladder carcinoma from May 1983 to june 1988. The results were as follows: 1. Of 36 cases, 11 cases were male and 25 cases were female, with a mean age of 63 years(range 31-87 years). 2. A mass filling the gallbladder, the most common finding , was seen in 16 cases (44.4%), and irregular thickening of the gallbladder in 5 cases (13.9%) and mixed type, irregular thickening of the gallbladder wall and intraluminal fungating mass, in 7 cases (19.4%). 3. Gallbladder stone was accompanied in 20 cases (55.5%) and bile duct dilatation was present in 17 cases (47.2%). 4. Metastasis to the other organs were as follows: lymphnode in 17 cases, liver in 22 cases, peritioneum in 13 cases, colon in 2 cases and intrahepatic bile duct in one case. 5. Gallbladder carcinoma were incorrectly diagnosed in 7 patients: 2 cases of acute cholecystitis, one of polyp, one of empyema and 3 cases in which no mass was detected in gallbladder. 6. Ultrasound and computed tomography were to be the method of choice in the evalution of the gallbladder carcinoma, especially ultrasound is very promising in detection of early and curable gallbladder carcinoma.