title: Intraepithelial lymphocytosis in architecturally preserved proximal small intestinal mucosa: an increasing diagnostic problem with a wide differential diagnosis.
abstract: BACKGROUND
  An increased intraepithelial lymphocyte density in an architecturally normal proximal small intestinal mucosal biopsy is a common finding facing surgical pathologists dealing with gastrointestinal biopsy specimens. Approximately 1% to 2% of all proximal small intestinal biopsies will show this change. It is increasingly recognized by surgical pathologists that gluten-sensitive enteropathy is an important cause of this pattern; however, gluten-sensitive enteropathy accounts for the minority of all cases. A wide variety of immunologic stimuli can raise intraepithelial lymphocyte numbers. Among the other common associations are enteric infection, autoimmune disease, drugs, and gastric Helicobacter infection.
  
  
  OBJECTIVE
  To outline the causes of intraepithelial lymphocytosis, to highlight the importance and the difficulties faced in establishing gluten-sensitive enteropathy as the cause, and to aid the surgical pathologist in the routine sign out of these cases.
  
  
  METHODS
  A review of the literature detailing the causes or associations of proximal small intestinal intraepithelial lymphocytosis is presented.
  
  
  CONCLUSIONS
  Increased lymphocyte numbers in the epithelium of architecturally preserved proximal small intestinal biopsies is a morphologic feature associated with a broad differential diagnosis.
authors.affiliation: Sullivan Nicolaides Pathology, Taringa, Queensland, Australia. ian_brown@snp.com.au
authors.forename: Ian
authors.initials: I
authors.lastname: Brown
authors.forename: Mari
authors.initials: M
authors.lastname: Mino-Kenudson
authors.forename: Vikram
authors.initials: V
authors.lastname: Deshpande
authors.forename: Gregory Y
authors.initials: GY
authors.lastname: Lauwers
mesh_terms: D001327:Autoimmune Diseases / Q000175:diagnosis; D001706:Biopsy; D002446:Celiac Disease / Q000175:diagnosis; D003937:Diagnosis, Differential; D064420:Drug-Related Side Effects and Adverse Reactions / Q000175:diagnosis; D005512:Food Hypersensitivity / Q000175:diagnosis; D005983:Glutens / Q000276:immunology; D006801:Humans; D007410:Intestinal Diseases / Q000175:diagnosis* / Q000209:etiology; D007411:Intestinal Diseases, Parasitic / Q000175:diagnosis; D007413:Intestinal Mucosa / Q000276:immunology / Q000473:pathology*; D007414:Intestinal Neoplasms / Q000175:diagnosis; D007421:Intestine, Small / Q000276:immunology / Q000473:pathology*; D008214:Lymphocytes / Q000276:immunology / Q000473:pathology; D008218:Lymphocytosis / Q000209:etiology / Q000473:pathology*
chemical_list: D005983:Glutens