What is a mucinuos cystic neoplasm of the pancrease (pancrelipase)?

Complicated. There are three possible entities to which you are referring. Mucinous cystadenoma (benign), mucinous cystadenosarcoma (malignant), and intraductal papillary mucinous tumor (benign or malignant). All three have certain appearances on imaging studies. They can be treated surgically and if malignant, have a better prognosis than "traditional" pancreatic cancer (adenocarcinoma).