title: Idiopathic pulmonary fibrosis: evaluation with positron emission tomography.
abstract: BACKGROUND
  The pathogenesis of interstitial lung disease remains under investigation, but may be related to increased inflammatory or cellular activity. This activity may be detectable with physiologic imaging.
  
  
  OBJECTIVE
  We investigated the role of physiologic imaging using (18)F-2-fluoro-2-deoxy-D-glucose ((18)FDG)-positron emission tomography (PET) scans in idiopathic pulmonary fibrosis (IPF).
  
  
  METHODS
  Seven male patients with histologically confirmed IPF underwent (18)FDG-PET scans. Scans were analyzed qualitatively and interpreted as positive or negative. Patients also underwent pulmonary function tests and computed tomography (CT) scans.
  
  
  RESULTS
  The average total lung capacity was 71 +/- 22% predicted (mean +/- SD) and diffusing capacity for carbon monoxide was 44 +/- 14% predicted. All had changes consistent with IPF on chest CT and 2 patients had ground glass attenuation. Six of seven patients (86%) had a positive (18)FDG-PET scan. Changes in the (18)FDG-PET scan were seen in 1 patient corresponding to changes in clinical status.
  
  
  CONCLUSIONS
  Our findings suggest that (18)FDG-PET scans may be helpful in the evaluation of IPF. Increased activity suggests active disease and changes in response to therapy.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, VA Greater Los Angeles Healthcare System, UCLA School of Medicine, Calif. 90073, USA.
authors.forename: Horst-Helmut
authors.initials: HH
authors.lastname: Meissner
authors.forename: Guy W
authors.initials: GW
authors.lastname: Soo Hoo
authors.forename: S Ali
authors.initials: SA
authors.lastname: Khonsary
authors.forename: Mark
authors.initials: M
authors.lastname: Mandelkern
authors.forename: Charles V
authors.initials: CV
authors.lastname: Brown
authors.forename: Silverio M
authors.initials: SM
authors.lastname: Santiago
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D002248:Carbon Monoxide / Q000378:metabolism; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008168:Lung / Q000473:pathology; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography; D011653:Pulmonary Diffusing Capacity; D011658:Pulmonary Fibrosis / Q000000981:diagnostic imaging*; D019275:Radiopharmaceuticals; D014057:Tomography, X-Ray Computed; D014109:Total Lung Capacity
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D002248:Carbon Monoxide