title: Intraductal papillary mucinous tumors of the pancreas comprise 2 clinical subtypes: differences in clinical characteristics and surgical management.
abstract: OBJECTIVE
  Intraductal papillary mucinous tumors (IPMTs) of the pancreas may be meaningfully construed as representing 2 clinically distinct subtypes: main duct tumors (MDT) and branch duct tumors (BDT).
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  University hospital from January 1988 through December 1994.
  
  
  METHODS
  We reviewed diagnostic findings and late results of surgical treatment in 30 patients with IPMT.
  
  
  RESULTS
  The tumor was located in the head of the pancreas more often in BDT than in MDT (65% [11/17] and 23% [3/13], respectively). Of the 13 patients with MDTs, 12 (92%) had intraductal papillary adenocarcinoma (noninvasive and minimally invasive types) and/or carcinoma in situ (carcinoma in situ: low papillary and/or flat tumor cells), and 3 (23%) had stromal invasion. Of the 17 patients with BDTs, 5 (29%) had intraductal papillary adenocarcinoma and/or carcinoma in situ. Two pancreatoduodenectomies and 8 pylorus-preserving pancreatoduodenectomies were performed in 10 of the 17 patients with BDTs, distal pancreatectomy in 7 patients with MDTs, and total pancreatectomy in 4 patients with MDTs. The 5-year survival rates were 47% for MDT and 90% for BDT. Four of 6 patients with MDTs who died had local recurrence. One patient died of liver metastasis and 1 of esophageal cancer. Only 1 patient with BDT of the 2 who died had recurrent disease.
  
  
  CONCLUSIONS
  Intraductal papillary mucinous tumors may be composed of 2 clinically distinct subtypes: MDTs and BDTs. Initially, although distal pancreatectomy can be recommended for most MDTs, the need for cancer-free margins in this more aggressive type may necessitate total pancreatectomy. Pylorus-perserving pancreatoduodenectomies is recommended for most BDTs, but, because these tumors are more often adenomas, a good prognosis can be expected.
authors.affiliation: First Department of Surgery, Tohoku University School of Medicine, Sendai, Japan. mkobari@mail.cc.tohoku.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Kobari
authors.forename: S
authors.initials: S
authors.lastname: Egawa
authors.forename: K
authors.initials: K
authors.lastname: Shibuya
authors.forename: H
authors.initials: H
authors.lastname: Shimamura
authors.forename: M
authors.initials: M
authors.lastname: Sunamura
authors.forename: K
authors.initials: K
authors.lastname: Takeda
authors.forename: S
authors.initials: S
authors.lastname: Matsuno
authors.forename: T
authors.initials: T
authors.lastname: Furukawa
mesh_terms: D000368:Aged; D002760:Cholangiopancreatography, Endoscopic Retrograde; D018291:Cystadenoma, Mucinous / Q000145:classification* / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D010190:Pancreatic Neoplasms / Q000145:classification* / Q000000981:diagnostic imaging / Q000401:mortality / Q000601:surgery*; D012189:Retrospective Studies; D015996:Survival Rate