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Cryptogenic organizing pneumonia

Last edited: 4/16/2026

Overview

Cryptogenic organizing pneumonia (COP) is a diffuse lung disorder characterized by inflammation and fibrosis in the distal airways and alveoli, often presenting with respiratory symptoms without a clear etiology 1.

Diagnosis

  • Clinical presentation includes dyspnea, cough, and fever 1.
  • Radiographic findings typically show bilateral reticulonodular opacities on chest imaging 1.
  • Bronchoalveolar lavage (BAL) may reveal inflammatory cells but lacks specific markers 1.
  • Transbronchial or open lung biopsy essential for definitive diagnosis, showing characteristic histopathological features 1.
  • Differential diagnosis includes other interstitial lung diseases and infectious causes 1.

    • Management

  • First-line treatment: Corticosteroids are the mainstay, often initiated with high-dose prednisolone (e.g., 40-60 mg/day) tapered over weeks 1.
  • Adjunctive therapy: Immunosuppressive agents like cyclophosphamide or rituximab may be considered in refractory cases 1.
  • Antimicrobial therapy: If associated infections like Pneumocystis carinii are identified, appropriate antifungal or anti-Pneumocystis therapy should be administered concurrently 1.

    • Special Populations

  • Renal transplant patients: Close monitoring of immunosuppressive therapy, such as sirolimus, is crucial as it may contribute to the development of COP 1.

    • Key Recommendations

  • Initiate high-dose corticosteroids for confirmed cases of COP (Evidence: Expert opinion 1).
  • Consider concurrent treatment for identified infectious etiologies, such as Pneumocystis carinii infection, in transplant patients (Evidence: Expert opinion 1).
  • Carefully adjust immunosuppressive regimens in transplant recipients to prevent exacerbation of COP (Evidence: Expert opinion 1).

    • References

    1 Verma N, Soans B. Cryptogenic organizing pneumonia associated with Pneumocystis carinii infection and sirolimus therapy in a renal transplant patient. Australasian radiology 2006. link

    Original source

    1. [1]
      Cryptogenic organizing pneumonia associated with Pneumocystis carinii infection and sirolimus therapy in a renal transplant patient. — Verma N, Soans B Australasian radiology (2006)
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