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Hard metal lung disease: a case series
Rafael Futoshi Mizutani1, Mário Terra-Filho1,2, Evelise Lima1
1Divisão de Pneumologia, Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo (SP) Brasil.
Summary
Hard metal lung disease (HMLD) is rare but critical to diagnose in exposed workers. Early clinical and occupational history, HRCT, and BAL findings can aid diagnosis, though outcomes vary with treatment.
Area of Science:
- Pulmonary Medicine
- Occupational Health
- Toxicology
Background:
- Hard metal lung disease (HMLD) is a rare occupational lung disease caused by inhaling hard metal particles, primarily cobalt and tungsten carbide.
- Early diagnosis and treatment are crucial for managing HMLD, but its rarity can pose diagnostic challenges.
Observation:
- A retrospective study identified 5 cases of HMLD (1.56%) among 320 patients with occupational respiratory diseases.
- Patients were male, with a mean age of 42 years and an average exposure of 11.4 years to hard metals.
- Common findings included restrictive lung disease, ground-glass opacities on HRCT, and multinucleated giant cells in bronchoalveolar lavage fluid.
Findings:
- Lung biopsies revealed various interstitial pneumonia patterns, including giant cell interstitial pneumonia.
- Treatment involved exposure cessation and corticosteroid therapy.
- Two patients showed clinical improvement, while three experienced disease progression.
Implications:
- HMLD should be considered in the differential diagnosis of respiratory issues in individuals with high occupational exposure to hard metals.
- A comprehensive clinical and occupational history, alongside HRCT and BAL findings, may suffice for diagnosis.
- Further research is needed to optimize HMLD management and improve patient outcomes.
