Pancreatic lesion was found by follow-up after acute pancreatitis. The case was diagnosed as a pseudocyst by surgical pathology. (a) US indicated cystic lesion in the tail of the pancreas (M: mass; P: pancreas), which contained low-echo solid components (arrow). The case was diagnosed as type IV by US. (b) There was no enhancement inside the cystic lesion in CEUS (the right picture). The case was diagnosed as type I by CEUS. (c) Enhanced CT indicated no enhancement in the cystic lesion. The case was diagnosed as type I.