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Chronic hypersensitivity pneumonitis.

Andrew Churg1, Nestor L Muller, Julia Flint

  • 1Department of Pathology, University of British Columbia, Vancouver, British Columbia, Canada. achurg@interchange.ubc.ca

The American Journal of Surgical Pathology
|January 26, 2006
PubMed
Summary
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Chronic hypersensitivity pneumonitis (HP) presents diverse fibrotic patterns, often mimicking other lung diseases. Recognizing granulomas and giant cells is key for diagnosis, even with extensive fibrosis.

Area of Science:

  • Pulmonary Medicine
  • Pathology
  • Radiology

Background:

  • Hypersensitivity pneumonitis (HP) is classified into acute, subacute, and chronic stages.
  • Chronic HP, characterized by fibrosis, has poorly defined pathological features.
  • This stage is often linked to a poor prognosis.

Purpose of the Study:

  • To define the pathological features of chronic hypersensitivity pneumonitis.
  • To identify diagnostic clues in the fibrotic stage of HP.
  • To correlate imaging findings with histopathology.

Main Methods:

  • Review of 13 cases of chronic HP with available exposure history.
  • Histopathological analysis of lung biopsy specimens.
  • Correlation with high-resolution CT (HRCT) findings.

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Main Results:

  • Three fibrotic patterns identified: UIP-like, NSIP-like, and peribronchiolar.
  • Presence of granulomas, giant cells, or Schaumann bodies crucial for diagnosis.
  • HRCT showed variable patterns, including severe fibrosis and ground-glass opacities.

Conclusions:

  • Chronic HP morphology can mimic usual interstitial pneumonia (UIP) or fibrotic nonspecific interstitial pneumonia (NSIP).
  • Diagnostic markers like granulomas, giant cells, and Schaumann bodies are vital when subacute HP is absent.
  • Peribronchiolar fibrosis may aid diagnosis; some patients improve with treatment despite fibrosis.