title: FDG uptake in axillary lymph nodes after vaccination against pandemic (H1N1).
abstract: OBJECTIVE
  To alert the imaging community to potential false positive findings related to current immunization programmes against H1N1 influenza virus.
  
  
  METHODS
  We reviewed 10 patients referred for positron emission tomography/computed tomography (PET/CT) who had undergone recent vaccination.
  
  
  RESULTS
  All studies showed( 18)F-fluorodeoxyglucose (FDG) uptake in the draining axillary lymph nodes close to the vaccination site, while low-dose CT revealed lymph nodes ranged between 0.5 cm and 1.2 cm at the same site.
  
  
  CONCLUSIONS
  This potential pitfall in PET/CT should be borne in mind during current vaccination programmes.
authors.affiliation: PET/CT Unit, Evangelismos General Hospital, 45-47 Ipsilantou Str, Athens, 106 76, Greece. m_panagiotidis@yahoo.com
authors.forename: Emmanouil
authors.initials: E
authors.lastname: Panagiotidis
authors.forename: Demetrios
authors.initials: D
authors.lastname: Exarhos
authors.forename: Irene
authors.initials: I
authors.lastname: Housianakou
authors.forename: Apostolos
authors.initials: A
authors.lastname: Bournazos
authors.forename: Ioannis
authors.initials: I
authors.lastname: Datseris
mesh_terms: D000328:Adult; D000368:Aged; D001365:Axilla; D004196:Disease Outbreaks; D005189:False Positive Reactions; D005260:Female; D019788:Fluorodeoxyglucose F18 / Q000493:pharmacokinetics*; D006115:Greece / Q000453:epidemiology; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology / Q000517:prevention & control; D008198:Lymph Nodes / Q000000981:diagnostic imaging*; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging*; D008297:Male; D008482:Mediastinum; D008875:Middle Aged; D009369:Neoplasms / Q000473:pathology*; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D014057:Tomography, X-Ray Computed
chemical_list: D007252:Influenza Vaccines; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18