Cystadenomas of the pancreas are uncommon tumors accounting for 5 to 15 percent of pan- creatic cystic lesions with less than 300 exarnples of this entity having been reported in the lit- erature. Cystadenomas are subdivided into microcystic adenoma(serous cystic adenoma) and mucinous cystic adenoma, the former does not appear to have any malignant potential, while the latter has to be considered as potentially malignant. Microcystic adenoma occurs in elderly patients, is twice as common in wornan, and originates from any location in the pancreas. In contrast, rnucinous cystic adenoma prevails in middle aged woman and is located most fre- quently in the body and tail of the pancreas. The tumors are discovered by chance during in- vestigation for causes of the pains. In some cases, the cyst may compress adjacent structures but a palpable mass is uncommon findings. The diagnosis may be suspected clinically, on ultra- sonography, computed tomography and endoscopic retrograde cholangiopancreaticography. We report each case of microcystic adenoma and mucinous cystic adenoma of the pancreas in 31 years old female and 57 years old female with a review of the literatures. (Korean J Gas- troenterol 1994; 26: 751 757)