title: Periampullary and pancreatic incidentaloma: a single institution's experience with an increasingly common diagnosis.
abstract: BACKGROUND
  While incidental masses in certain organs have received particular attention, periampullary and pancreatic incidentalomas (PIs) remain poorly characterized.
  
  
  METHODS
  We reviewed 1944 consecutive pancreaticoduodenectomies (PD) over an 8-year period (April 1997 to October 2005). A total of 118 patients (6% of all PDs) presented with an incidental finding of a periampullary or pancreatic mass. The PI patients were analyzed and compared with the rest of the cohort (NI, nonincidentaloma group, n = 1826).
  
  
  RESULTS
  Thirty-one percent of the PI patients (n = 37) had malignant disease (versus 76% of the NI patients, P < 0.001), 47% (n = 55) had premalignant disease, and the remaining 22% (n = 26) had little or no risk for malignant progression. The 3 most common diagnoses in the PI group were IPMN without invasive cancer (30%), cystadenoma (17%), and pancreatic ductal adenocarcinoma (10%). The PI group had a higher overall complication rate (55% versus 43%, P = 0.02), due in part to a significantly increased rate of pancreatic fistulas (18.4% PI versus 8.5% NI, P < 0.001). Patients in the PI group with malignant disease had a superior long-term survival (median, 30 months, P = 0.01) compared with patients in the NI group with malignant disease (median, 21 months).
  
  
  CONCLUSIONS
  Incidentally discovered periampullary and pancreatic masses comprise a substantial proportion of patients undergoing PD. Roughly three fourths of these lesions are malignant or premalignant, and amenable to curative resection. Resected malignant PIs have favorable pathologic features as compared with resected malignant NIs, and resection of these early lesions in asymptomatic individuals is associated with improved survival, compared with patients with symptomatic disease.
authors.affiliation: Department of Surgery, Johns Hopkins Medical Institutions, Baltimore, MD, USA.
authors.forename: Jordan M
authors.initials: JM
authors.lastname: Winter
authors.forename: John L
authors.initials: JL
authors.lastname: Cameron
authors.forename: Keith D
authors.initials: KD
authors.lastname: Lillemoe
authors.forename: Kurtis A
authors.initials: KA
authors.lastname: Campbell
authors.forename: David
authors.initials: D
authors.lastname: Chang
authors.forename: Taylor S
authors.initials: TS
authors.lastname: Riall
authors.forename: Joann
authors.initials: J
authors.lastname: Coleman
authors.forename: Patricia K
authors.initials: PK
authors.lastname: Sauter
authors.forename: Marcia
authors.initials: M
authors.lastname: Canto
authors.forename: Ralph H
authors.initials: RH
authors.lastname: Hruban
authors.forename: Richard D
authors.initials: RD
authors.lastname: Schulick
authors.forename: Michael A
authors.initials: MA
authors.lastname: Choti
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Yeo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014670:Ampulla of Vater; D003138:Common Bile Duct Neoplasms / Q000175:diagnosis* / Q000453:epidemiology; D005260:Female; D006801:Humans; D033162:Incidental Findings; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000175:diagnosis* / Q000453:epidemiology