title: Intraductal oncocytic papillary neoplasm of the pancreas: report of a case requiring completion pancreatectomy.
abstract: BACKGROUND
  Cystic tumors of the pancreas have been diagnosed with increasing frequency. Intraductal oncocytic papillary neoplasm is a rare type of cystic pancreatic tumor. Intraductal oncocytic papillary neoplasm is considered a distinct entity with the potential of developing into invasive carcinoma and it should be differentiated from other cystic tumors of the pancreas, including mucinous cystic neoplasm and other forms of intraductal papillary mucinous neoplasm (IPMN). Histologically, the formation of oncocytic cells and the complex morphology of the papillae distinguish intraductal oncocytic papillary neoplasm from IPMN. While the number of publications addressing the diagnosis, management and follow-up of patients with IPMN has been increasing, the behavior differences between IPMN and intraductal oncocytic papillary neoplasm have not been elucidated, secondary to very limited clinical experience.
  
  
  METHODS
  Here, we are presenting a case of a patient with the diagnosis of intraductal oncocytic papillary neoplasm of the pancreas developing into invasive cancer.
  
  
  CONCLUSIONS
  This case stresses the necessity for lifelong surveillance of the remnant pancreas following partial pancreatectomy for intraductal oncocytic papillary neoplasm, due to the risk of developing multifocal disease.
authors.affiliation: Section of GI, Tumor and Endocrine Surgery, Department of Surgery, University of Colorado at Denver, Aurora, CO 80045, USA.
authors.forename: Max V
authors.initials: MV
authors.lastname: Wohlauer
authors.forename: Martine
authors.initials: M
authors.lastname: McManus
authors.forename: Norio
authors.initials: N
authors.lastname: Fukami
authors.forename: Csaba
authors.initials: C
authors.lastname: Gajdos
mesh_terms: D021441:Carcinoma, Pancreatic Ductal / Q000175:diagnosis* / Q000601:surgery; D002291:Carcinoma, Papillary / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D010180:Pancreatectomy; D010183:Pancreatic Ducts / Q000473:pathology* / Q000601:surgery; D010190:Pancreatic Neoplasms / Q000175:diagnosis* / Q000601:surgery; D016896:Treatment Outcome