[en] We conclude that multilocular cysts are 3 cm and over, or elevated types as in mucin producing pancreatic tumors must be neoplasm in the pathological study. But, we question whether or not we can diagnose the elevated type before the operation. So, for the purpose of making a clear guideline of diagnosis for elevated types, we examined 46 operating cases of mucin producing tumors (Kuroda type I) documented from 1985 to 1994. We examined existence, height and properties of elevated lesions, 25 cases of elevated type and 21 cases of flat type. There is a significant difference of height with US and CT, and existence of enhancement with CT. As a result, we have obtained the following guidelines. The height of an elevated lesion with US is 4 mm and over, and the height of that with CT is 3 mm and over. It is enhanced with CT. Therefore, we find it possible to diagnose elevated types with US and CT. (author)