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Diffuse interstitial lung disease due to AA amyloidosis.

C Planes1, D Kleinknecht, M Brauner

  • 1Service de Pneumologie, Hôpital Avicenne, Bobigny, France.

Thorax
|April 1, 1992
PubMed
Summary

A rare case of AA amyloidosis caused interstitial lung disease and nephrotic syndrome in a man. No underlying condition was found to predispose him to this form of amyloidosis.

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Area of Science:

  • Nephrology
  • Pulmonology
  • Pathology

Background:

  • AA amyloidosis is a systemic disease characterized by extracellular deposition of serum amyloid A protein.
  • It typically arises secondary to chronic inflammatory conditions, infections, or malignancies.
  • Primary or idiopathic AA amyloidosis, without an identifiable underlying cause, is exceptionally rare.

Observation:

  • A male patient presented with a constellation of symptoms indicative of significant organ damage.
  • Diagnostic workup revealed interstitial lung disease, a condition affecting lung tissue.
  • Further investigations confirmed nephrotic syndrome, a kidney disorder characterized by protein loss in urine.

Findings:

  • Biopsies and clinical evaluation confirmed the presence of AA amyloidosis as the underlying pathology.

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  • Crucially, extensive investigations failed to identify any predisposing condition, such as chronic inflammation or infection.
  • This suggests a rare instance of idiopathic AA amyloidosis.

    • Implications:

    • This case highlights the potential for AA amyloidosis to manifest with severe pulmonary and renal involvement.
    • The absence of a secondary cause underscores the importance of considering idiopathic AA amyloidosis in the differential diagnosis.
    • Further research into the pathogenesis of idiopathic AA amyloidosis may be warranted to understand its mechanisms and improve patient outcomes.