title: Surgical treatment of intraductal papillary-mucinous tumor (IPMT) of the pancreas: operative indications based on surgico-pathologic study focusing on invasive carcinoma derived from IPMT.
abstract: OBJECTIVE
  Between 1979 and 2000, 51 patients with intraductal papillary-mucinous tumor (IPMT) of the pancreas underwent surgical resection.
  
  
  METHODS
  The patients were reviewed to disclose the surgical pathology of invasive carcinoma derived from IPMT and to determine the surgical indications for IPMT on the basis of the pathologic findings.
  
  
  RESULTS
  The incidence of invasive carcinoma derived from IPMT according to the localization of the tumor was as follows: 4/9 (44%) in the main pancreatic duct (MPD type), 4/9 (44%) showing ductal spread from the MPD to branch ducts (mixed type), and 2/33 (6%) in the 2 branch duct (branch type). The maximal size of the intraductal spread of invasive carcinomas (8 of 18 cases in the MPD and mixed type together and 2 of 33 cases in the branch type) was as follows: 6/8 (75%) in the MPD and mixed type were over 6 cm in size, and the 2-branch-type invasive carcinomas were within the 3-cm size range.
  
  
  CONCLUSIONS
  We concluded that for both invasive and noninvasive IPMTs, surgical resection was necessary for any MPD or mixed-type IPMTs, and that surgical resection was appropriate for branch-type lesions larger than or equal to 3 cm in diameter, or for lesions smaller than 3 cm showing rapid growth on clinical images.
mesh_terms: D000368:Aged; D021441:Carcinoma, Pancreatic Ductal / Q000473:pathology / Q000601:surgery*; D002760:Cholangiopancreatography, Endoscopic Retrograde; D018291:Cystadenoma, Mucinous / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D010190:Pancreatic Neoplasms / Q000473:pathology / Q000601:surgery*; D011856:Radiographic Image Enhancement; D012189:Retrospective Studies