including serous cystadenoma and mucinous cystic neoplasms(mucinous cystadenorna and cystadenocarcinoma). Pseudocysts may resolve spontaneously or may require a drainage procedure, but total excision is the ideal treatment for pancreatic cystadenoma because it is a true neoplasm which probably posseses a malignant potential. The authors have reviewed 9 patients(4 patients of mucinous cystadenoma and 5 patient.s of mucinous cystadenocarcinoma) from January 1981 to December 1990. There were 8 women and 1 man with the mean age of 49.3 years(range, 27 to 68 years). Abdominal pain was the most common symptom(6 patients) with the palpable mass in 3 patients. Ijltrasonography showed cystic mass in 7 patients(77.8% ). Of those 6 patients who underwent C;T, ll detected the lesion without difficulty. Endoscopic retrograde cholangiopancreatography(F,RCP) were performed in 5 patients with the findings of duct displacements in 3 patients and abrupt cut- off of pancreatic duct in 1 patients and there was no comrnunication between main duct and cyst. Tail was the most common location of the tumor(5 patients) with mean size of 8.9cm (range, 2.0 to 22.0cm). Curative resection were possible in 6 patient(66.7%). Survival time was obtainable in 6 patients. After excluding 2 patients whom died 4 rnonths and 6 months after surgery respectively, the median survival duration was 27 months(maximum 69 months).