title: Nonfunctional neuroendocrine tumor of the pancreas: Case report and review of the literature.
abstract: BACKGROUND
  Pancreatic neuroendocrine tumors (PNET) have an incidence of one per 100,000 individuals per year. They represent about 1-2% of all pancreatic tumors. PNETs are a heterogeneous group with various clinical presentations and lineage. Non functional PNET (NF-PNET) are incidentally discovered in most cases. This article presents a review of NF-PNET and the case of a patient with this disease, in addition to its diagnosis, clinical presentation, and treatment.
  
  
  METHODS
  The patient is a 37-year-old asymptomatic man who was sent from his reference unit because of a pancreatic tumor that was visualized incidentally during a laparotomy performed three months before due to an acute abdomen secondary to blunt abdominal trauma. A CT scan was requested that showed a retroperitoneal mass 7.5cm×6.6cm×7cm with infiltration of the duodenal wall. Endoscopy was performed, which reported a duodenal ulcer with nonconclusive histological findings. A percutaneous biopsy was obtained out and a diagnosis of a neuroendocrine tumor was made. Chemotherapy was started because infiltration of the portomesenteric axis was suspected. The patient presented signs of toxicity during his third cycle and therefore was scheduled for exploratory laparotomy. Pancreatoduodenectomy was performed with a histologic diagnosis of a pancreatic neuroendocrine tumor.
  
  
  CONCLUSIONS
  The presentation of a NF-PNET is nonspecific. They continue to be tumors with a low incidence and few studies directed toward early detection and management have been carried out. Currently, CT scans are the studies most used for detection.
  
  
  CONCLUSIONS
  Surgical treatment is preferred in patients without evidence of unresectability with longer survival. The characteristics of NF-PNETs make their detection difficult and new strategies are needed for early detection and management. New studies in early stages with new cytotoxics or analogs are promising.
authors.affiliation: Digestive and Endocrine Surgery Service, Centro Médico Nacional del Noreste UMAE 25 IMSS, Monterrey, Mexico. Electronic address: ackaos_10@hotmail.com.
authors.forename: A
authors.initials: A
authors.lastname: Amador Cano
authors.forename: F
authors.initials: F
authors.lastname: García
authors.forename: A
authors.initials: A
authors.lastname: Espinoza
authors.forename: N
authors.initials: N
authors.lastname: Bezies
authors.forename: E
authors.initials: E
authors.lastname: Herrera
authors.forename: J
authors.initials: J
authors.lastname: De Leija Portilla