Although cystic neoplasms of the pancreas are an uncommon disease, it occurs often enough that proper surgical management depends on accurate preoperative diagnosis. It is very difficult to diagnose accurately by conventional radiological methods alone. Angiographic findings are fairly characteristic for these tumors, but they are in no way specific. The imaging characteristics of ultrasonography and computed tomography are particularly useful in the diagnosis of this particular tumors. The report presents an analysis of 2 cases of cystandenoma and 3 cnases cystandenocarcinoma examined by ultrasonography and computed tomography. Ultrasonographic findings are complex multicytic mass in the pancreas with thick irregular wall, daughter cyst, septa and solid component. These septa and solid component are highly echogenic if the tumor is mucin producing. Computed tomographic findings are large cyst possessing irregular thick wall, solid component and septa which are enhanced by contrast infusion. Punctate or curvilinear calcification is seen occasionally. Tortuous or beaded vascular collaterals are seen around the cyst. On the other hand, pseudocyst is usually a single cyst possessing thin smooth wall, and solid component or septa are unusual in pseudocyst.