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Rare-earth pneumoconiosis: a new case
American Journal of Industrial Medicine
|January 1, 1986
Summary
A rare case of rare-earth (RE) pneumoconiosis was diagnosed in a former photoengraver. Analysis revealed abnormal RE levels in lung lavage fluid and nails, despite the patient being asymptomatic.
Area of Science:
- Occupational Medicine
- Toxicology
- Pulmonary Medicine
Background:
- Rare-earth (RE) pneumoconiosis is an uncommon occupational lung disease.
- Exposure to rare-earth elements can occur in specific industrial settings.
Observation:
- A former photoengraver with a 13-year work history presented with symptoms and radiographic findings suggestive of pneumoconiosis.
- Chest X-ray revealed a diffuse nodular pattern consistent with pneumoconiosis (q 2/3-ILO/1980).
Findings:
- Bronchoalveolar lavage fluid analysis detected abnormal levels of multiple rare-earth elements (La, Ce, Nd, Sm, Tb, Yb, Lu).
- Neutron activation analysis and X-ray energy spectrometry confirmed the presence of these elements.
- Elevated rare-earth levels were also found in the patient's nails, indicating systemic absorption.
Implications:
- This case highlights the potential for developing rare-earth pneumoconiosis even after cessation of exposure.
- The findings suggest that rare-earth elements absorbed from the lungs can distribute systemically.
- Further research is warranted to understand the long-term health effects and diagnostic markers of RE pneumoconiosis.