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Multiple pulmonary hyalinizing granulomas associated with systemic idiopathic fibrosis
S Kuramochi1, T Kawai, K Yakumaru
1Department of Pathology, Keio University School of Medicine, Tokyo, Japan.
Acta Pathologica Japonica
|May 1, 1991
Summary
Pulmonary hyalinizing granulomas (PHGs) may be part of a larger systemic idiopathic fibrosis complex. This case highlights the potential link between PHGs, fibrosis, and immunologic abnormalities.
Area of Science:
- Pathology
- Immunology
- Pulmonology
Background:
- Pulmonary hyalinizing granulomas (PHGs) are rare lung lesions.
- Systemic idiopathic fibrosis encompasses various fibrotic conditions of unknown cause.
- The relationship between PHGs and systemic fibrosis is not well-defined.
Observation:
- A 41-year-old male presented with progressive nodular lung infiltration over two years.
- Autopsy revealed bilateral pulmonary hyalinizing granulomas (PHGs).
- The patient also exhibited constrictive pericarditis, retroperitoneal fibrosis, mediastinal fibrosis, and other fibrotic manifestations, leading to a diagnosis of systemic idiopathic fibrosis.
Findings:
- PHGs were characterized by dense hyaline collagen bundles and inflammatory infiltration.
- The patient had positive anti-thyroglobulin and anti-thyroid microsomal antibodies, along with lymphocytic thyroiditis.
- The observed PHG inflammatory process was active, and the clinical course was progressive.
Implications:
- This case suggests PHGs may represent a manifestation within the spectrum of systemic idiopathic fibrosis.
- Immunologic abnormalities could play a role in the pathogenesis of both PHGs and systemic idiopathic fibrosis.
- Further research is warranted to elucidate the connection between these conditions and immune system dysregulation.