title: A case of annular pancreas accompanied with intraductal papillary mucinous neoplasm-case report.
abstract: OBJECTIVE
  Annular pancreas is a rare congenital anomaly characterized by pancreatic tissues wrapping completely or incompletely around the descending duodenum. In most patients with annular pancreas, onset occurs in early childhood. Adults with annular pancreas are prone to duodenal ulcers and pancreatitis. Intraductal papillary mucinous neoplasm (IPMN) is a type of papillary mucinous secretory epithelial tumor, which originates in the main pancreatic duct and/or branch duct. We report a case of annular pancreas accompanied with intraductal papillary mucinous neoplasm.
  
  
  METHODS
  A 52-year-old male patient hospitalized due to recurrent upper abdominal pain for one and a half years was enrolled in this study.
  
  
  RESULTS
  One case of annular pancreas accompanied with intraductal papillary mucinous neoplasm which manifested as recurrent chronic pancreatitis was found. After pancreaticoduodenectomy, the patient died from uncontrollable gastrointestinal bleeding.
  
  
  CONCLUSIONS
  To the best of our knowledge, this is the first case in China and the second case worldwide of annular pancreas accompanied with IPMN in English literature.
authors.affiliation: Department of General Surgery, The China Japan Friendship Hospital of Jilin University Changchun 130012, China.
authors.forename: Fu-Jian
authors.initials: FJ
authors.lastname: Ji
authors.affiliation: Department of General Surgery, The China Japan Friendship Hospital of Jilin University Changchun 130012, China.
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Tian
authors.affiliation: Department of General Surgery, The China Japan Friendship Hospital of Jilin University Changchun 130012, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Wei
authors.affiliation: Department of General Surgery, The China Japan Friendship Hospital of Jilin University Changchun 130012, China.
authors.forename: Xue-Dong
authors.initials: XD
authors.lastname: Fang
authors.affiliation: Department of General Surgery, The China Japan Friendship Hospital of Jilin University Changchun 130012, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Cao
authors.affiliation: Department of General Surgery, The China Japan Friendship Hospital of Jilin University Changchun 130012, China.
authors.forename: Hong-Yong
authors.initials: HY
authors.lastname: Jin
keywords: Annular pancreas; chronic pancreatitis; intraductal papillary mucinous neoplasm; pancreatic fistula; pancreaticoduodenectomy