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Microangiitis in lupus-induced pulmonary hemorrhage
American Journal of Clinical Pathology
|May 1, 1986
Summary
Systemic lupus erythematosus (SLE) can cause massive pulmonary hemorrhage due to a distinctive small-vessel vasculitis, termed microangiitis. This finding in lung biopsies may be a reliable diagnostic indicator for SLE.
Area of Science:
- Rheumatology
- Pulmonology
- Pathology
Background:
- Systemic lupus erythematosus (SLE) is an autoimmune disease with diverse clinical manifestations.
- Pulmonary hemorrhage is a severe complication of SLE, posing diagnostic challenges.
Purpose of the Study:
- To characterize the histopathological findings in lung biopsies of patients with SLE and pulmonary hemorrhage.
- To evaluate the diagnostic utility of microangiitis in SLE-related pulmonary hemorrhage.
Main Methods:
- Open-lung biopsies were performed on four patients with SLE and massive pulmonary hemorrhage.
- Histopathological examination focused on small-vessel vasculitis (microangiitis).
- Immunofluorescence and electron microscopy were used to detect immune complexes.
Main Results:
- A distinctive small-vessel vasculitis (microangiitis) was identified in all four patients.
- Capillaritis with necrotic neutrophils and alveolar septal destruction was consistently observed.
- Arteriolar and small artery involvement occurred in three patients; immune complexes were found in only two.
Conclusions:
- Acute microangiitis in lung biopsies is a characteristic finding in SLE-associated pulmonary hemorrhage.
- Microangiitis may serve as a more reliable diagnostic marker for SLE than immune complex detection.