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Micronodular pattern organising pneumonia mimicking miliary lung disease: a rare radiological presentation
  1. David Ng1,2,
  2. Garun S Hamilton3,
  3. Eric Hu4 and
  4. Kenneth K Lau1,2
  1. 1Department of Diagnostic Imaging, Monash Health, Clayton, Victoria, Australia
  2. 2School of Clinical Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria, Australia
  3. 3Department of Respiratory and Sleep Medicine, Monash Health, Clayton, Victoria, Australia
  4. 4Department of Pathology, Monash Health, Clayton, Victoria, Australia
  1. Correspondence to Dr David Ng; davidng132{at}


Organising pneumonia (OP) is an interstitial lung disease characterised by granulation tissues in alveoli and alveolar ducts. Typical imaging findings are migratory airspace opacities with peripheral or peribronchovascular distribution. Diffuse micronodular OP (MNOP) is a rare imaging manifestation, which has imaging differential diagnosis of endobronchial infection such as tuberculosis, hypersensitivity pneumonitis and respiratory bronchiolitis. Although clinical and ancillary radiological findings may aid in refining the differential diagnosis, histopathological assessment is frequently required for this rare presentation due to implications of treatment and prognosis. We report a case of MNOP and performed a review of the literature.

  • respiratory medicine
  • interstitial lung disease
  • pneumonia (respiratory medicine)
  • tuberculosis
  • radiology

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  • Contributors Authors listed on the submitted article contributed significantly to the preparation, analysis and presentation of the data, drafting of the manuscript and are accountable for all aspects of the manuscript. All authors listed fulfil the criteria of authorship (as per the BMJ case report criteria). No one else who fulfils the criteria has been excluded as an author.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer-reviewed.

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