Objective:To explore the CT findings and features of pancreatic serous cystadenoma, mucinous cystadenoma and mucinous cystadenocarcinoma. Methods:Clinical data and spiral CT findings of 26 cases with pathologically proven pancreatic cystic tumors were analyzed retrospectively. Results:Thirteen lesions were serous cystadenoma which showed round or lobulated cystic or cystic-solid tumor, fibrotic septum were seen in 7 cases and central dot calcification were found in 5 cases. Cystic wall and septum was enhanced in portal venous phase imaging. Eight lesions were mucinous cystadenoma, they showed round or irregular low density mass, and 2 of them were single cyst and 6 cases were multiple cyst. The cystic wall was uneven and calcification of cystic wall and septum were found in 2 lesions. Five lesions were mucinous cystadenocarcinoma. Wall nodules were relatively large. One case located in the pancreatic head had occurred pancreatic duct dilatation and with serum CA-199 increased. Internal calcification was detected in 1 case and peripancreatic fat space was obscured in 2 cases. Conclusion:The CT imaging can display the size, shape, internal characteristic of pancreatic cystadenoma and relationship with adjacent tissue, it provides important information for clinical diagnosis and therapy.