title: Influenza A pneumonia presenting as progressive focal infiltrates in a stem cell transplant recipient.
abstract: BACKGROUND
  Stem cell transplant recipients are susceptible to pulmonary infections, including influenza A. Typically, isolated influenza pneumonia has a diffuse, interstitial infiltrate pattern.
  
  
  OBJECTIVE
  To describe the unusual clinical and radiographic course of influenza A pneumonia in a stem cell transplant recipient.
  
  
  METHODS
  Case report in which microbiologic assays, bronchoscopic and pathologic specimens are obtained.
  
  
  RESULTS
  We describe a patient with influenza A pneumonia 8 months following a peripheral blood stem cell transplant who presented with minimal respiratory symptoms and rapidly progressing, focal pulmonary infiltrates. The large size and appearance of the masses have not been reported before in a patient with isolated influenza.
  
  
  CONCLUSIONS
  This case highlights the differences of presentation and importance of early diagnosis and treatment of immunocompromised patients infected with influenza.
authors.affiliation: Department of Medicine, University of Washington, Harborview Medical Center, 325 Ninth Avenue, Box 359938, Seattle, WA 98104-2499, USA. jdscott@u.washington.edu
authors.forename: John D
authors.initials: JD
authors.lastname: Scott
authors.forename: Janet A
authors.initials: JA
authors.lastname: Englund
authors.forename: David
authors.initials: D
authors.lastname: Myerson
authors.forename: Adam P
authors.initials: AP
authors.lastname: Geballe
mesh_terms: D000328:Adult; D001706:Biopsy; D005260:Female; D006801:Humans; D007251:Influenza, Human / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology*; D015466:Leukemia, Myeloid, Chronic-Phase / Q000628:therapy; D008168:Lung / Q000473:pathology; D036102:Peripheral Blood Stem Cell Transplantation / Q000009:adverse effects*; D011024:Pneumonia, Viral / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology*; D014057:Tomography, X-Ray Computed