Abstract: [Abstract] Objective: To investigate the imaging features of gallbladder carcinoma, and to elevate the ability of MSCT and MRI in diagnosis of gallbladder carcinoma. Methods: All imaging data of 30 patients confirmed by surgery and pathology were retrospectively analyzed. MSCT scans were performed in 28 patients, 14 patients accepted MRI examinations. The direct signs and indirect signs of primary gallbladder carcinoma lesions were evaluated.All images were compared with gross pathology. Results: Gallbladder carcinoma apeared at CT and MRI as irregular gallblader wall thickening, intraluminal nodules, and mass completely occupying or replacing the gallbladder lumen. 11of all were focal or diffuse asymmetric gallbladder wall thickening, 10 were intraluminal nodules, 9 were mass occupying or replacing the gallbladder lumen. Irregularly thickened gallblader wall, intraluminal nodules and/or mass were strongly enhanced after triple-phase enhanced scan.There were 23 cases with gallbladder stones, 13 with dilated intra/extrahepatic bile duct, 11 directly invading adjacent liver parenchyma, 3 involving the stomach and 5 involving duodenum, 16 with lymph node metastasis, 3 with liver metastasis, 5 with ascites. MRI could show all above-mentioned signs. It was difficult to judge the lymph nodes on CT in 4 cases. 3 cases with isodensity stones were not detected on CT. Conclusions: CT and MRI could clearly show the primary tumor, and accurately evaluate the extent and spread of invasion. However, MRI showed indirect signs, such as gallbladder stones and regional lymph node metastasis better than CT.

Key words: Gallbladder carcinoma, Tomography, X-ray computed, Meganetic resonance imaging