It is well known that realtime ultlrasonography is the primary diagnostic modality to evaluate gallbladderdiseases. The authors studied ultrasonographic findings of 10 pathologically proven gallbladder carcinomapatients, and it was compared with the findings of 4 cases of ERCP and 2 cases of CT which were performed at thesame period. The results were as follows; 1. They were 6 males and 4 females with over 50 years of age except a 41year old female. 2. The ultrasonographic classifications of the cases were 4 of fungating mass types, 3 of massfilling gallbladder types, 2 wall thickening types and 1 of mixed type, wall thickneing and fungating mass. 3.Seven cases of cholecystitis, 6 cases of intrahepatic biliary duct dilatation, 5 cases of gallstone, 4 cases ofcommon bile duct dilatation, 4 cases of sludge bile, 2 cases of gallbladder dilatation, 1 case of right subphrenicand pericholecystic abscess due to perforated gallbladder. 4. Five cases of mesenteric infiltration, 3 cases ofhepatic infiltration adjacent to gallbladdr, 2 cases of lymphatic metastasis to right lobe of liver and 2 cases ofpericholedochal and pericaval lymph node metastasis. 5. The indistinct margin between gallbladder and surroundingorgan adjacent to gallbladder mass or gallbladder wall thickneing suggest cancer infiltration to adjacent organsuch as liver or omentum. 6. If gallstone is engulfed in thickened gallbladder wall, the wall thickening suggestsgallbaldder carcinoma. 7. The differentiation between fungating mass and sludge bile, and the determination ofmass could be done by positional change. 8. The preoperative ultrasonic diagnostic accuracy was in 9 out of 10cases (90%). 9. Because of the frequent cystic duct obstruction by associated inflammation, the diagnosticaccuracy of ERCP fro gallbladder carcinoma was low.