title: Pancreatic primary lymphoma: a case report and review of the literature.
abstract: BACKGROUND
  Primary pancreatic lymphoma is a rare but treatable malignancy (less than 1% of pancreatic tumors) that may be clinically confused with pancreatic adenocarcinoma.
  
  
  METHODS
  In a patient with upper abdominal pain, ultrasonography and CT detected a mass in pancreatic head, which compressed the common bile duct. The patient received a Whipple's operation and intraoperative frozen sections of the mass showed an anaplastic carcinoma. Immunohistochemical staining was used to indicate the origin and prognosis of tumor.
  
  
  RESULTS
  Grossly the tumor involved the pancreatic head, soft in consistence and invaded part of the gastric wall. Histologically, the tumor was composed mainly of large and moderate neoplastic cells, which were diffusely positive for CD20 and Bcl-6 antigens, indicating the features of diffusely large B cell lymphoma.
  
  
  CONCLUSIONS
  The proper diagnosis of the tumor should be made with CD20 and Bcl-6 immunohistochemical study. Radical surgery is indicated for resectable carcinoma but not for a chemosensitive lymphoma.
authors.affiliation: Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai 200032, China. yji@zshospital.com
authors.forename: Yuan
authors.initials: Y
authors.lastname: Ji
authors.forename: Tian-Tao
authors.initials: TT
authors.lastname: Kuang
authors.forename: Yun-Shan
authors.initials: YS
authors.lastname: Tan
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
authors.forename: Hai-Ying
authors.initials: HY
authors.lastname: Zeng
authors.forename: Da-Yong
authors.initials: DY
authors.lastname: Jin
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D008223:Lymphoma / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D011859:Radiography