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Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease
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Cobalt related interstitial lung disease.

Traci N Adams1, Yasmeen M Butt2, Kiran Batra3

  • 1University of Texas Southwestern Medical Center, Department of Pulmonary and Critical Care Medicine, United States.

Respiratory Medicine
|July 23, 2017
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Summary

Cobalt exposure causes interstitial lung disease (ILD) through immune or oxidant injury. Diagnosis requires occupational history, imaging, and sometimes biopsy, with removal from exposure being key treatment.

Keywords:
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Area of Science:

  • Occupational Medicine
  • Pulmonology
  • Toxicology

Background:

  • Cobalt exposure in industries like hard metal and diamond tooling is a known cause of interstitial lung disease (ILD).
  • The pathogenesis is theorized to involve immunologic reactions or oxidant injury.
  • Cobalt-related ILD can manifest acutely or chronically, often with upper respiratory symptoms.

Purpose of the Study:

  • To outline the diagnostic approach and management strategies for cobalt-related interstitial lung disease.

Main Methods:

  • Evaluation involves a detailed occupational history.
  • Diagnostic tools include pulmonary function tests (PFTs), high-resolution computed tomography (HRCT), and bronchoalveolar lavage (BAL).
  • Histopathologic examination, including lung biopsy if necessary, is crucial, with "cannibalistic" multinucleated giant cells being diagnostic.

Main Results:

  • HRCT findings are often nonspecific, mimicking other interstitial lung diseases such as idiopathic pulmonary fibrosis (IPF), sarcoidosis, or hypersensitivity pneumonitis.
  • The presence of "cannibalistic" multinucleated giant cells in BAL fluid, coupled with exposure history and imaging, is diagnostic.
  • Pathologic patterns can include giant cell interstitial pneumonia, IPF, desquamative interstitial pneumonia (DIP), or hypersensitivity pneumonitis (HP).

Conclusions:

  • Early recognition of cobalt exposure is critical for managing ILD.
  • Removal from the source of cobalt exposure is the primary treatment intervention.
  • Corticosteroid therapy may lead to improvements in symptoms, lung function, and radiographic findings.