title: High-resolution CT findings of severe acute respiratory syndrome at presentation and after admission.
abstract: OBJECTIVE
  The aim of this study was to assess the high-resolution CT (HRCT) findings at presentation and after hospital admission in patients with severe acute respiratory syndrome (SARS).
  
  
  METHODS
  We reviewed the HRCT findings at presentation (n = 12) and after hospital admission (n = 25) of 29 patients with SARS and compared the HRCT findings with the radiographic findings. HRCT scans were obtained using 1-mm (n = 28) or 2-mm (n = 1) collimation. The radiographs and HRCT scans were reviewed independently by two observers who reached a decision by consensus.
  
  
  RESULTS
  All patients had abnormal findings on HRCT at presentation. Eight of these 12 patients had normal findings on radiographs. The predominant HRCT findings at presentation consisted of unilateral (n = 6) or bilateral (n = 2) ground-glass opacities or focal unilateral (n = 2) or bilateral (n = 2) areas of consolidation. All patients showed progression of disease on follow-up. The predominant HRCT findings on follow-up CT scans consisted of unilateral (n = 2) or bilateral ground-glass opacities (n = 13), unilateral (n = 2) or bilateral consolidation (n = 5), or a mixed bilateral pattern of ground-glass attenuation, consolidation, and reticulation (n = 3). Reticulation with associated architectural distortion and mild traction bronchiectasis was present in eight patients.
  
  
  CONCLUSIONS
  HRCT can show parenchymal abnormalities in patients with SARS who have normal findings on radiographs at presentation. Follow-up CT scans obtained in hospitalized patients show findings consistent with fibrosis in a small percentage of patients.
authors.affiliation: Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 W 12th Ave., Vancouver, BC V5Z 1M9, Canada.
authors.forename: Nestor L
authors.initials: NL
authors.lastname: Müller
authors.forename: Gaik C
authors.initials: GC
authors.lastname: Ooi
authors.forename: Pek Lan
authors.initials: PL
authors.lastname: Khong
authors.forename: Lin J
authors.initials: LJ
authors.lastname: Zhou
authors.forename: Kenneth W T
authors.initials: KW
authors.lastname: Tsang
authors.forename: Savvas
authors.initials: S
authors.lastname: Nicolaou
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003955:Diagnostic Tests, Routine; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010343:Patient Admission; D013902:Radiography, Thoracic; D012189:Retrospective Studies; D045169:Severe Acute Respiratory Syndrome / Q000000981:diagnostic imaging*; D013997:Time Factors; D014057:Tomography, X-Ray Computed