title: Cytomegalovirus infection presenting as isolated inflammatory polyps of the gastrointestinal tract.
abstract: BACKGROUND
  Gastrointestinal involvement by cytomegalovirus (CMV) infection is a well recognised complication in patients taking steroid/immunosuppressive therapy or suffering from immunodeficiency and debilitating diseases. Rarely, CMV may affect immunocompetent healthy individuals. However, CMV infection presenting as isolated inflammatory polyps is unusual.
  
  
  METHODS
  We describe five patients (1 infant and 4 adults 56-80 years of age) with CMV-associated polyps that posed diagnostic difficulty. Four lesions were initially misdiagnosed as inflammatory fibroid polyp (n = 2), atypical/suspicious lymphoproliferative (n = 1) and mesenchymal (n = 1) lesion.
  
  
  RESULTS
  Underlying diseases were kidney transplantation (1), ulcerative colitis (1), and HIV infection (1). One elderly patient had pseudomembranous colitis but no significant co-morbidity. One patient had no relevant diseases. The lesions affected the colon (3), small intestine (1) and gastric antrum (1); one was multifocal. The size ranged from 0.3 cm to 2.0 cm. Histologically, all lesions showed extensive surface ulceration and abundant capillary-rich granulation tissue containing activated lymphoid cells, plasma cells, granulocytes, enlarged histiocytes and atypical fibroblasts. Eosinophils were prominent in two cases. Immunohistochemistry showed unequivocal intranuclear CMV inclusions.
  
  
  CONCLUSIONS
  These cases widen the spectrum of endoscopic and histological appearance of gastrointestinal CMV infection. Awareness of these unusual lesions should enhance detection and proper classification of this probably under-recognised CMV presentation.
authors.affiliation: Institute of Pathology, University Hospital, Erlangen, Germany. abbas.agaimy@uk-erlangen.de
authors.forename: Abbas
authors.initials: A
authors.lastname: Agaimy
authors.forename: Jonas
authors.initials: J
authors.lastname: Mudter
authors.forename: Bruno
authors.initials: B
authors.lastname: Märkl
authors.forename: Runjan
authors.initials: R
authors.lastname: Chetty
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003587:Cytomegalovirus / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism; D003586:Cytomegalovirus Infections / Q000175:diagnosis* / Q000378:metabolism; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D016867:Immunocompromised Host; D007223:Infant; D007410:Intestinal Diseases / Q000175:diagnosis* / Q000821:virology; D007417:Intestinal Polyps / Q000175:diagnosis* / Q000601:surgery; D045586:Intranuclear Inclusion Bodies / Q000378:metabolism / Q000473:pathology / Q000821:virology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013272:Stomach Diseases / Q000175:diagnosis* / Q000821:virology