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Chronic eosinophilic pneumonia progressing to lung fibrosis
1Third Dept of Internal Medicine, Sapporo Medical University School of Medicine, Japan.
The European Respiratory Journal
|August 1, 1994
Summary
This case study highlights eosinophilic lung disease, showing corticosteroid therapy improved lung opacities but not fibrosis or eosinophilia. Biomarkers like intercellular adhesion molecule-1 better indicated disease activity than blood eosinophil counts.
Area of Science:
- Pulmonology
- Immunology
- Radiology
Background:
- Eosinophilic lung diseases (ELDs) are a group of disorders characterized by eosinophil infiltration into the lungs.
- Diagnosis and monitoring of ELDs can be challenging, with varying responses to treatment.
Observation:
- A 65-year-old Japanese man presented with fever and subpleural opacities on CT, which resolved with corticosteroids.
- Four years later, he developed severe eosinophilia, ground-glass opacities, and honeycombing suggestive of lung fibrosis.
- Lung biopsy revealed intra-alveolar eosinophil infiltration and a desquamative interstitial pneumonia-like reaction.
Findings:
- Corticosteroid therapy led to decreased ground-glass opacities and clinical improvement.
- However, lung honeycombing and blood eosinophilia persisted despite treatment.
- Circulating intercellular adhesion molecule-1 and eosinophil granule proteins in lavage fluid were more sensitive markers of disease activity than blood eosinophil counts.
Implications:
- This case suggests that while corticosteroids can manage inflammatory aspects of some eosinophilic lung conditions, underlying fibrosis may be refractory.
- Intercellular adhesion molecule-1 and eosinophil granule proteins may serve as valuable biomarkers for assessing disease activity and treatment response in eosinophilic lung diseases.
- Further research into novel therapeutic targets for fibrotic changes in ELDs is warranted.