title: Organizing pneumonia: chest HRCT findings.
abstract: To determine the frequency of HRCT findings and their distribution in the lung parenchyma of patients with organizing pneumonia.
  
  
  
  This was a retrospective review of the HRCT scans of 36 adult patients (26 females and 10 males) with biopsy-proven organizing pneumonia. The patients were between 19 and 82 years of age (mean age, 56.2 years). The HRCT images were evaluated by two independent observers, discordant interpretations being resolved by consensus.
  
  
  
  The most common HRCT finding was that of ground-glass opacities, which were seen in 88.9% of the cases. The second most common finding was consolidation (in 83.3% of cases), followed by peribronchovascular opacities (in 52.8%), reticulation (in 38.9%), bronchiectasis (in 33.3%), interstitial nodules (in 27.8%), interlobular septal thickening (in 27.8%), perilobular pattern (in 22.2%), the reversed halo sign (in 16.7%), airspace nodules (in 11.1%), and the halo sign (in 8.3%). The lesions were predominantly bilateral, the middle and lower lung fields being the areas most commonly affected.
  
  
  
  Ground-glass opacities and consolidation were the most common findings, with a predominantly random distribution, although they were more common in the middle and lower thirds of the lungs.
authors.affiliation: Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Igor Murad
authors.initials: IM
authors.lastname: Faria
authors.affiliation: Federal University of Rio de Janeiro, Petrópolis, Brazil.
authors.forename: Gláucia
authors.initials: G
authors.lastname: Zanetti
authors.affiliation: Department of Radiological Diagnosis, Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Miriam Menna
authors.initials: MM
authors.lastname: Barreto
authors.affiliation: Department of Radiological Diagnosis, Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Rosana Souza
authors.initials: RS
authors.lastname: Rodrigues
authors.affiliation: Department of Internal Medicine and Diagnostic Support, Universidade Federal da Bahia, Salvador, Brazil.
authors.forename: Cesar Augusto
authors.initials: CA
authors.lastname: Araujo-Neto
authors.affiliation: Department of Internal Medicine and Diagnostic Support, Universidade Federal da Bahia, Salvador, Brazil.
authors.forename: Jorge Luiz Pereira e
authors.initials: JL
authors.lastname: Silva
authors.affiliation: Department of Clinical Medicine, Universidade Federal do Paraná, Curitiba, Brazil.
authors.forename: Dante Luiz
authors.initials: DL
authors.lastname: Escuissato
authors.affiliation: São José do Rio Preto School of Medicine, São José do Rio Preto, Brazil.
authors.forename: Arthur Soares
authors.initials: AS
authors.lastname: Souza
authors.affiliation: Department of Radiology, Royal Liverpool and Broadgreen University Hospital, Liverpool, United Kingdom.
authors.forename: Klaus Loureiro
authors.initials: KL
authors.lastname: Irion
authors.affiliation: Hospital Anchieta, Taguatinga, Brazil.
authors.forename: Alexandre Dias
authors.initials: AD
authors.lastname: Mançano
authors.affiliation: Universidade Federal de Santa Catarina, Florianópolis, Brazil.
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Nobre
authors.affiliation: Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil.
authors.forename: Bruno
authors.initials: B
authors.lastname: Hochhegger
authors.affiliation: Fluminense Federal University, Niterói, Brazil.
authors.forename: Edson
authors.initials: E
authors.lastname: Marchiori
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil; D018549:Cryptogenic Organizing Pneumonia / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D036542:Tomography, Spiral Computed; D055815:Young Adult