Comparison between cryptogenic organizing pneumonia and connective tissue disease-related organizing pneumonia

Rheumatology (Oxford). 2011 May;50(5):932-8. doi: 10.1093/rheumatology/keq410. Epub 2010 Dec 17.


Objective: Although the overall prognosis of CTD-related interstitial pneumonia is better than that of idiopathic interstitial pneumonia, the prognosis of CTD-related organizing pneumonia (CTD-OP) was suggested to be worse than that of cryptogenic organizing pneumonia (COP). The aim of this study was to compare the clinical features and outcome of the two conditions.

Methods: A retrospective review of 100 patients diagnosed by lung biopsy as having organizing pneumonia patterns (CTD, 24; COP, 76) at three tertiary referral centres.

Results: Underlying CTDs were mostly RA, SS and PM/DM. The median follow-up period was 43.6 months. There were no differences in initial symptoms, lung function or bronchoalveolar lavage fluid findings except significantly more females (83.3 vs. 59.2%, P = 0.048) in the CTD-OP than in the COP group. Over 80% of the patients in both the groups improved. However, complete recovery rate was lower in CTD-OP (20.8%) than in COP (46.1%; P = 0.028) with a tendency towards higher recurrence rate in CTD-OP (40.0 vs 20.3%; P = 0.072). There was no significant difference in the frequency of rapid progression or overall survival between the two groups.

Conclusions: The clinical features and prognosis of CTD-OP are similar to COP. However, lower complete recovery rate with a tendency towards higher recurrence rate in CTD-OP compared with COP suggest the need for closer follow-up in patients with CTD-OP.

Publication types

  • Comparative Study
  • Multicenter Study

MeSH terms

  • Adult
  • Aged
  • Biopsy
  • Connective Tissue Diseases / complications*
  • Cryptogenic Organizing Pneumonia / diagnosis
  • Cryptogenic Organizing Pneumonia / pathology*
  • Diagnosis, Differential
  • Female
  • Humans
  • Lung / pathology
  • Lung / physiopathology
  • Male
  • Middle Aged
  • Pneumonia / diagnosis
  • Pneumonia / etiology*
  • Pneumonia / pathology*
  • Prognosis
  • Recurrence
  • Respiratory Function Tests
  • Retrospective Studies