title: Serial high-resolution computed tomography imaging in patients with Wegener granulomatosis: differentiation between active inflammatory and chronic fibrotic lesions.
abstract: OBJECTIVE
  To evaluate pulmonary pathologies in Wegener granulomatosis with sequential computed tomography (CT) in order to differentiate active inflammatory lesions from chronic fibrotic lesions.
  
  
  METHODS
  Serial CT findings in 38 patients with Wegener granulomatosis were retrospectively analyzed (mean follow-up period, 21 months). The presence, extension, and distribution of the following findings were evaluated with CT: parenchymal nodules, masses, ground-glass attenuation, airspace consolidation, bronchial wall-thickening, bronchiectasis, linear areas of attenuation, pleural irregularities, pleural effusions, hilar and mediastinal lymphadenopathy.
  
  
  RESULTS
  Observed in 92% of patients, nodules were the most common CT pathology. Areas of ground-glass attenuation, consolidation, masses of linear attenuation, and tracheal/bronchial wall-thickening were detected in 24%, 26%, 32%, 39%, and 68% of patients. At follow-up, the clearance of lesions was most consistent for areas of ground-glass attenuation (89%), masses (87%), and cavitated nodules (85%). In the follow-up scan, 58% of all nodules, 47% of pulmonary consolidations, and 66% of bronchial wall-thickening were completely resolved. Areas of bronchiectasis and septal/non-septal lines remained stable in 70% and 71% of patients.
  
  
  CONCLUSIONS
  The majority of the lesions decreased or resolved completely with or without areas of linear attenuation. Ground-glass attenuation, cavitated nodules and masses appear to represent active inflammatory lesions. In most probability, areas of bronchiectasis and septal/non-septal lines more often represent chronic fibrotic changes rather than active inflammatory changes. In combination with clinical evaluation and bronchoscopy, CT assists in the assessment of disease activity.
authors.affiliation: Division of Diagnostic Radiology, Department of Radiology, University Hospital of Freiburg, Freiburg, Germany. lohrmann@mrs1.ukl.uni-freiburg.de
authors.forename: C
authors.initials: C
authors.lastname: Lohrmann
authors.forename: M
authors.initials: M
authors.lastname: Uhl
authors.forename: O
authors.initials: O
authors.lastname: Schaefer
authors.forename: N
authors.initials: N
authors.lastname: Ghanem
authors.forename: E
authors.initials: E
authors.lastname: Kotter
authors.forename: M
authors.initials: M
authors.lastname: Langer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002908:Chronic Disease; D003937:Diagnosis, Differential; D005260:Female; D005355:Fibrosis / Q000175:diagnosis; D005500:Follow-Up Studies; D014890:Granulomatosis with Polyangiitis / Q000175:diagnosis*; D006801:Humans; D007249:Inflammation / Q000175:diagnosis*; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*