title: Serous cystadenoma causing the double duct sign.
abstract: METHODS
  An asymptomatic 70-year-old man was found to have elevated liver function tests on a routine screening evaluation. Abdominal ultrasound revealed a pancreatic head mass. Magnetic resonance cholangiopancreatography confirmed a heterogeneously enhancing pancreatic mass that was suspicious for malignancy due to obstruction of the common bile duct and pancreatic duct. Consequently a pylorus-sparing pancreaticoduodenectomy was performed. Histology revealed a serous cystadenoma with scattered foci of PanIN III.
  
  
  CONCLUSIONS
  Serous cystadenomas are benign tumors without significant malignant potential. Unlike pancreatic adenocarcinomas, these tumors tend to be slow growing, well-demarcated, and rarely, as in this case, produce a mass effect.
authors.affiliation: Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Zain
authors.initials: Z
authors.lastname: Khalpey
authors.forename: Taufiek Konrad
authors.initials: TK
authors.lastname: Rajab
authors.forename: Stanley W
authors.initials: SW
authors.lastname: Ashley
mesh_terms: D000368:Aged; D049448:Cholangiopancreatography, Magnetic Resonance; D018293:Cystadenoma, Serous / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D010183:Pancreatic Ducts / Q000002:abnormalities*; D010190:Pancreatic Neoplasms / Q000175:diagnosis* / Q000601:surgery; D016577:Pancreaticoduodenectomy; D014057:Tomography, X-Ray Computed