Pulmonary · PANCE / PANRE

Pneumoconioses (Silicosis, Asbestosis, Coal Worker's, Berylliosis)

Occupational interstitial lung diseases from inhaled inorganic dusts.

Also known as: silicosis, asbestosis, coal worker's pneumoconiosis, CWP, black lung, berylliosis, pneumoconiosis

Overview

Group of interstitial lung diseases caused by chronic inhalation of inorganic mineral dusts in occupational settings. Major forms: silicosis (silica), asbestosis (asbestos fibers), coal worker's pneumoconiosis (coal dust), and chronic beryllium disease (beryllium — granulomatous, sarcoid-like).

Epidemiology

Resurgence of accelerated silicosis among young engineered stone (quartz) countertop workers in US/Australia. Asbestosis declining due to bans but legacy exposures persist. CWP persists in coal mining regions globally. Berylliosis in aerospace, electronics, ceramics workers.

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Risk factors

Silicosis: mining, quarrying, sandblasting, foundry work, engineered stone (quartz) countertop fabrication, ceramics, glass manufacture
Asbestosis: shipbuilding, construction (insulation, roofing), automotive brake/clutch work, asbestos mining (legacy exposures dominate)
Coal worker's pneumoconiosis: underground coal mining (cumulative exposure)
Berylliosis: aerospace, nuclear, electronics, ceramic and dental laboratory work
Cumulative exposure duration and intensity drive risk; smoking synergistic for malignancy

Pathophysiology

Inhaled mineral particles reach alveoli; alveolar macrophages phagocytose but cannot digest them → chronic inflammation, fibrogenic cytokine release (TGF-beta, TNF-alpha), fibroblast proliferation, collagen deposition. Silica is the most cytotoxic and fibrogenic. Asbestos fibers (amphiboles especially) cause pleural plaques, fibrosis, and malignancy. Beryllium triggers a delayed-type hypersensitivity (CD4 T-cell) granulomatous response indistinguishable histologically from sarcoidosis.

Clinical presentation

Symptoms

Progressive exertional dyspnea (most common across all forms)
Cough — often non-productive; productive with chronic bronchitis in CWP
Chest discomfort
Constitutional symptoms in advanced disease
Asbestos: long latency (20-40 years from first exposure)
Acute silicosis: rapidly progressive dyspnea after heavy short-term exposure (engineered stone, sandblasting)

Signs / physical exam

Bibasilar Velcro crackles (asbestosis, advanced silicosis)
Clubbing (asbestosis > silicosis)
Findings of cor pulmonale in advanced disease
Pleural plaques on imaging suggest asbestos exposure

Classic findings

Silicosis: upper-lobe nodules with hilar 'eggshell' calcifications. Asbestosis: lower-lobe fibrosis + pleural plaques (often calcified). CWP: small upper-lobe rounded opacities, may progress to progressive massive fibrosis. Berylliosis: indistinguishable from sarcoidosis.

Differential diagnosis

Idiopathic pulmonary fibrosis — No occupational exposure history; UIP pattern; older male smokers
Sarcoidosis — Granulomatous disease without beryllium exposure; mediastinal lymphadenopathy; non-caseating granulomas
Tuberculosis — Silicosis predisposes — silicotuberculosis; always exclude with sputum AFB/IGRA
Hypersensitivity pneumonitis — Organic dust exposure (birds, mold), upper-lobe centrilobular nodules, lymphocytic BAL
Connective tissue disease-ILD — Autoimmune features; positive serologies (ANA, RF, anti-CCP)
Lung cancer / mesothelioma (asbestos) — Mass lesion, pleural thickening with rind; biopsy diagnostic

Diagnostic workup

Labs

Detailed occupational history is essential
Beryllium lymphocyte proliferation test (BeLPT) — definitive for chronic beryllium disease
QuantiFERON / PPD in silicosis (increased TB risk — silicotuberculosis)
Sarcoid workup if granulomatous: ACE, calcium, exclude alternatives

Imaging

CXR: simple silicosis — upper-lobe small (<10 mm) rounded opacities; complicated silicosis — progressive massive fibrosis (>10 mm conglomerate masses); eggshell calcification of hilar nodes
Asbestosis: lower-lobe reticular/honeycomb fibrosis + pleural plaques (often calcified diaphragmatic), shaggy heart border
CWP: small rounded opacities upper lobes, similar to silicosis but without eggshell calcifications
HRCT: characterize fibrosis distribution, nodule pattern, pleural disease, exclude malignancy
PFTs: restrictive pattern with reduced DLCO; obstructive component in CWP with chronic bronchitis

Other studies

Bronchoscopy with biopsy if diagnosis uncertain or malignancy suspected
BeLPT (blood or BAL) for chronic beryllium disease
Lung biopsy rarely needed when occupational exposure + classic imaging are present

Diagnostic algorithm

Pneumoconiosis	Exposure	CXR Pattern	Distinctive Features
Silicosis	Quartz dust (mining, sandblasting, engineered stone)	Upper-lobe small nodules; eggshell hilar node calcification; PMF	TB risk; autoimmune associations; accelerated form in engineered stone workers
Asbestosis	Asbestos fibers (construction, shipbuilding)	Lower-lobe reticular fibrosis; pleural plaques	Long latency (20-40 yr); risk of mesothelioma and lung cancer (synergy with smoking)
Coal Worker's Pneumoconiosis	Coal dust (mining)	Upper-lobe small rounded opacities; PMF in complicated disease	Black lung; Caplan syndrome with RA
Chronic Beryllium Disease	Beryllium dust (aerospace, electronics, ceramics)	Mimics sarcoidosis — hilar adenopathy + granulomas	BeLPT diagnostic; treat with steroids like sarcoid

Comparison of the four major pneumoconioses — exposure, radiographic pattern, and distinguishing features.

Treatment

First-line

No specific cure for any pneumoconiosis — supportive care is the mainstay
Remove from further exposure (legally protected occupational right)
Smoking cessation — especially critical in asbestos exposure (synergistic lung cancer risk; ~50× in smokers with asbestos vs ~5× alone)
Vaccinations: annual influenza, pneumococcal, COVID-19, RSV (age ≥60), Tdap
Pulmonary rehabilitation, supplemental oxygen for hypoxemia
Treat comorbid airflow obstruction (bronchodilators, ICS) in CWP
Annual TB screening (IGRA) in silicosis; treat LTBI; consider 4-drug therapy if active
Chronic beryllium disease — corticosteroids (prednisone 20-40 mg/day) for symptomatic disease, similar to sarcoidosis

Second-line / adjunct

Lung transplantation for end-stage disease in select patients
Surveillance for malignancy in asbestos-exposed: low-dose CT screening, especially with concomitant smoking; awareness for mesothelioma (insidious chest pain, pleural effusion, pleural thickening)
Whole-lung lavage for severe acute silicosis (anecdotal, specialized centers)
Antifibrotic therapy (pirfenidone, nintedanib) — emerging role for progressive pulmonary fibrosis phenotype, including occupational ILDs (PF-ILD)
Workers' compensation and occupational disease reporting

Complications

Progressive massive fibrosis (silicosis, CWP)
Tuberculosis and atypical mycobacterial infection (especially silicosis)
Lung cancer (all pneumoconioses, multiplied by smoking)
Mesothelioma (asbestos — even brief exposure; latency 20-40 years)
Pulmonary hypertension, cor pulmonale, respiratory failure
Caplan syndrome (rheumatoid pneumoconiosis with large necrotic nodules)
Autoimmune disease (silicosis — increased scleroderma, RA, SLE)

PANCE pearls

Engineered stone (quartz) countertops have caused a global epidemic of accelerated silicosis in young workers — high silica content + dry cutting.
Eggshell calcification of hilar lymph nodes is the classic silicosis finding.
Pleural plaques (often calcified diaphragmatic) are pathognomonic for asbestos exposure but do not require asbestosis; mesothelioma can occur without asbestosis.
Silicosis dramatically increases TB risk — screen annually with IGRA; consider isoniazid prophylaxis even with intermediate risk.
Chronic beryllium disease mimics sarcoidosis histologically — BeLPT testing distinguishes; ask about aerospace, electronics, ceramic dust exposure.

References

ATS 2010 — ATS Statement on Occupational Contribution to the Burden of Airway Disease (Am J Respir Crit Care Med 2003)
MMWR 2019 — Severe Silicosis in Engineered Stone Fabrication Workers — California, Colorado, Texas, and Washington, 2017-2019 (Rose et al., MMWR 2019)
Helsinki Criteria 2014 — Asbestos, Asbestosis, and Cancer — Helsinki Criteria for Diagnosis and Attribution 2014 (Wolff et al., Scand J Work Environ Health 2016)
ATS 2014 — Chronic Beryllium Disease — ATS Official Statement (Balmes et al., Am J Respir Crit Care Med 2014)

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