title: Primary Hodgkin disease of the ileum complicating Crohn disease.
abstract: BACKGROUND
  Primary gastrointestinal lymphoma currently is considered to be an uncommon complication of chronic inflammatory bowel disease. All tumors reported in which recently developed techniques, such as immunohistochemical markers, were used for lymphoma classification proved to be non-Hodgkin lymphomas. Gastrointestinal lymphomas developing in Crohn disease are a very heterogeneous group, with tumors of both B-cell and T-cell lineage represented, along with some tumors of equivocal phenotype. By contrast, gastrointestinal lymphomas complicating ulcerative colitis all have proved to be so-called polymorphic B-cell lymphomas.
  
  
  METHODS
  The current report describes another case of primary gastrointestinal lymphoma complicating chronic inflammatory bowel disease occurring in the ileum of a 34-year-old man with a 3-year history of Crohn disease.
  
  
  RESULTS
  Histopathologic findings were in keeping with nodular sclerosing Hodgkin disease. Broad birefringent collagen bands divided the tumor into well-defined nodules consisting of typical Reed-Sternberg cells and lacunar variants admixed with a polymorphous lymphoid infiltrate. By immunohistochemical studies, Reed-Sternberg cells and lacunar variants stained positively for Leu-M1 (CD15) and Ber H2 (CD30). The background lymphocytes were primarily of T-cell phenotype.
  
  
  CONCLUSIONS
  To the knowledge of the authors, this article reports the first case of primary gastrointestinal Hodgkin disease in association with chronic inflammatory bowel disease that has been confirmed by immunohistochemical studies.
authors.affiliation: Department of Pathology, A.Z. Sint-Jan, Bruges, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Vanbockrijck
authors.forename: M
authors.initials: M
authors.lastname: Cabooter
authors.forename: J
authors.initials: J
authors.lastname: Casselman
authors.forename: J
authors.initials: J
authors.lastname: Vanvuchelen
authors.forename: A
authors.initials: A
authors.lastname: Van Hoof
authors.forename: P
authors.initials: P
authors.lastname: Michielssen
mesh_terms: D000328:Adult; D003424:Crohn Disease / Q000150:complications* / Q000473:pathology; D006689:Hodgkin Disease / Q000150:complications* / Q000473:pathology; D006801:Humans; D007078:Ileal Neoplasms / Q000150:complications* / Q000473:pathology; D007079:Ileitis / Q000150:complications / Q000473:pathology; D008297:Male