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Structural features of interstitial lung disease in systemic sclerosis.
N K Harrison1, A R Myers, B Corrin
1Department of Thoracic Medicine, National Heart and Lung Institute, Brompton Hospital, London, UK.
The American Review of Respiratory Disease
|September 1, 1991
Summary
Systemic sclerosis and lone cryptogenic fibrosing alveolitis show similar early lung changes, including inflammation and fibrosis. This suggests a shared pathological process in interstitial lung disease.
Area of Science:
- Pulmonary Medicine
- Rheumatology
- Pathology
Background:
- Systemic sclerosis (SSc) lung studies often focus on end-stage fibrosis from autopsy data.
- Open-lung biopsies in SSc suggest inflammatory similarities to cryptogenic fibrosing alveolitis (CFA).
Purpose of the Study:
- To compare early lung histology in SSc-associated interstitial lung disease (ILD) with lone CFA.
- To characterize morphologic features of early SSc-ILD.
Main Methods:
- Analysis of 49 open-lung biopsies from 34 SSc patients with ILD.
- Comparison with 22 age- and sex-matched lone CFA biopsies.
- Light and electron microscopy of lung tissue.
Main Results:
- Early SSc-ILD shows patchy inflammation (lymphocytes, plasma cells, macrophages) and fibrosis.
- No qualitative or quantitative differences found between SSc-ILD and lone CFA, except more lymphoid hyperplasia in SSc.
- Interstitial inflammation inversely correlated with patient age and disease duration.
- Decreased DLCO correlated with fibrosis and architectural lung loss.
Conclusions:
- SSc-ILD and lone CFA share similar early histopathologic features.
- Early SSc-ILD is characterized by inflammation and fibrosis, not solely end-stage disease.
- Focal lymphoid hyperplasia may be more common in SSc-ILD.