<unk>  can occur due to a variety of reasons, among them pancreatitis (chronic), pancreatic neoplasm and/or pancreatic trauma.
Pancreatic pseudocyst
Intraductal papillary mucinous neoplasm
Pancreatic cyst
Pancreatic abscess
Pancreatic fistula
Annular pancreas
Gastrojejunocolic fistula
Postcholecystectomy syndrome