title: A case of gangliocytic paraganglioma in the ampulla of Vater.
abstract: BACKGROUND
  Duodenal gangliocytic paraganglioma is an extremely rare tumor and few cases have been reported to date.
  
  
  METHODS
  The authors report a case of gangliocytic paraganglioma verified by post-op pathology after pancreaticoduodenectomy for a tumor in the ampulla of Vater. The 56-year-old male patient concerned visited our emergency room with melena that started one week prior to hospitalization. The patient was diagnosed to have a tumor in the ampulla of Vater with bleeding on its surface. However post-op, he was diagnosed as having gangliocytic paraganglioma by immunohistochemistry.
  
  
  CONCLUSIONS
  This tumor has precise clinical implications, and if continuous follow up is conducted after careful diagnosis and surgical treatment, invasive major operations, such as, radical pancreaticoduodenectomy can be avoided.
authors.affiliation: Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Junsik
authors.initials: J
authors.lastname: Kwon
authors.forename: Seung Eun
authors.initials: SE
authors.lastname: Lee
authors.forename: Mee Joo
authors.initials: MJ
authors.lastname: Kang
authors.forename: Jin-Young
authors.initials: JY
authors.lastname: Jang
authors.forename: Sun-Whe
authors.initials: SW
authors.lastname: Kim
mesh_terms: D014670:Ampulla of Vater / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D003138:Common Bile Duct Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D016577:Pancreaticoduodenectomy; D010235:Paraganglioma / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D009418:S100 Proteins / Q000032:analysis
chemical_list: D009418:S100 Proteins