title: A selective approach to the resection of cystic lesions of the pancreas: results from 539 consecutive patients.
abstract: OBJECTIVE
  To define a group of patients with pancreatic cysts who do not require resection.
  
  
  BACKGROUND
  The increased use of cross-sectional imaging has resulted in an increased identification of small, asymptomatic pancreatic cysts. Data have not been available to determine which lesions should be resected.
  
  
  METHODS
  All patients evaluated at our institution between January 1995 and January 2005 for the ICD-9 diagnosis of pancreatic cyst were reviewed. Analysis was performed to identify associations between patient and cyst characteristics, and selection of operative or nonoperative management.
  
  
  RESULTS
  Pancreatic cysts were evaluated in 539 patients. Initial management was operative in 170 patients (32%), and nonoperative (radiographic follow-up) in 369 patients (68%). Factors associated with initial operative management included presence of a solid component (45% vs. 6%, P < 0.001), larger size of the lesion (mean 4.8 cm vs. 2.4 cm, P = 0.001), and presence of symptoms (44% vs. 16%, P = 0.001). Malignancy was present in 18% (32 of 170) of patients initially resected. Mucinous tumors (n = 18) were the most common malignant histologic subtype. None of the invasive cancers arising from mucinous cysts was <3 cm. Median radiographic follow-up in patients initially managed nonoperatively was 24 months (range, 1-172 months). In 29 patients (8%), changes developed within the cyst that resulted in resection; malignancy was present in 11 of 39 (38%), representing 3% (11 of 369) of all patients being followed radiographically.
  
  
  CONCLUSIONS
  Selected patients with cystic lesions <3 cm in diameter and without a solid component may be followed radiographically with a malignancy risk (3% this study) that approximates the risk of mortality from resection. Malignancy within mucinous tumors is associated with size, and small mucinous tumors are very unlikely to be malignant.
authors.affiliation: Memorial Sloan-Kettering Cancer Center, USA. allenp@mskcc.org
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Allen
authors.forename: Michael
authors.initials: M
authors.lastname: D'Angelica
authors.forename: Mithat
authors.initials: M
authors.lastname: Gonen
authors.forename: David P
authors.initials: DP
authors.lastname: Jaques
authors.forename: Daniel G
authors.initials: DG
authors.lastname: Coit
authors.forename: William R
authors.initials: WR
authors.lastname: Jarnagin
authors.forename: Ronald
authors.initials: R
authors.lastname: DeMatteo
authors.forename: Yuman
authors.initials: Y
authors.lastname: Fong
authors.forename: Leslie H
authors.initials: LH
authors.lastname: Blumgart
authors.forename: Murray F
authors.initials: MF
authors.lastname: Brennan
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010180:Pancreatectomy / Q000379:methods*; D010181:Pancreatic Cyst / Q000175:diagnosis / Q000601:surgery*; D018579:Patient Selection