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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Question 1PulmonaryMedium
A 40-year-old sandblaster with 20 years of exposure has progressive dyspnea, upper lobe nodular opacities with eggshell calcification of mediastinal lymph nodes on CT, and restrictive pulmonary function tests (PFTs). Which of the following is the most important ongoing surveillance for this patient?
ASerial sputum cytology
BPeriodic serum BNP
CTuberculosis screening
DAnnual spirometry
ESerial calcium and angiotensin-converting enzyme (ACE) levels
Reveal answer & full explanation
Correct answer: C — Tuberculosis screening
ASerial sputum cytology
BPeriodic serum BNP
CTuberculosis screening✓
DAnnual spirometry
ESerial calcium and angiotensin-converting enzyme (ACE) levels
Why Tuberculosis screening is correct
Silica-laden alveolar macrophages are impaired, so silicosis raises the risk of active tuberculosis (TB) about 4-fold (pooled relative risk, Ehrlich et al., BMC Public Health 2021), and the risk rises with radiographic grade; CDC lists silicosis as a risk factor for progression from latent infection to TB disease
Silicosis is a high-risk condition for progression to active TB: test for latent TB infection with an interferon-gamma release assay (IGRA) or tuberculin skin test (TST), treat if positive, and evaluate promptly for active TB with any new symptoms or radiographic change
ATS (1997), as cited in OSHA's silica standard Appendix B (2016), lists a silicosis diagnosis as an indication for annual TB testing
Repeat testing applies only while results stay negative; once a test is positive, repeat IGRA/TST adds nothing, and after latent TB treatment, surveillance means prompt workup of new symptoms or radiographic change for active TB
Why the others are wrong
Periodic serum BNP — monitors heart failure; not a standard surveillance measure for silicosis complications (confused-with cardiac disease)
Serial calcium and angiotensin-converting enzyme (ACE) levels — used to track sarcoidosis activity, not silicosis (confused-with sarcoidosis)
Annual spirometry — serial lung function is a legitimate part of silicosis follow-up (it tracks progression and guides specialist and transplant referral), but it monitors the disease rather than preventing a complication. TB testing is not a one-time check here: silicosis is itself an indication for repeat testing, because finding and treating latent TB can avert a life-threatening, transmissible complication (right-concept-wrong-priority)
Serial sputum cytology — silica is a recognized lung carcinogen, which makes cancer surveillance tempting, but sputum cytology screening did not lower lung cancer mortality in trials, and it does nothing about the latent TB that silicosis makes more likely to progress to active disease (superseded screening method)
Additional high-yield points
Silicosis is caused by crystalline silica inhalation from sandblasting, mining, quarrying, and tunneling
Eggshell calcification of hilar and mediastinal lymph nodes is characteristic of silicosis (also seen in sarcoidosis)
PFTs may be normal in simple silicosis; with progression they show a restrictive, obstructive, or mixed pattern, and DLCO falls in advanced disease or progressive massive fibrosis
No curative treatment exists; remove from silica exposure immediately
Lung transplant is reserved for end-stage disease
Question 2PulmonaryEasy
A 42-year-old man who works in construction presents with progressive dyspnea and a dry cough over 5 years. He denies smoking. CXR shows bilateral upper lobe nodular opacities with eggshell calcification of hilar lymph nodes. Pulmonary function tests (PFTs) show a mixed obstructive and restrictive pattern. What is the most likely diagnosis?
ASarcoidosis
BCoal worker's pneumoconiosis
CSilicosis
DAsbestosis
EBerylliosis
Reveal answer & full explanation
Correct answer: C — Silicosis
ASarcoidosis
BCoal worker's pneumoconiosis
CSilicosis✓
DAsbestosis
EBerylliosis
Why Silicosis is correct
Silicosis is caused by inhalation of crystalline silica dust from occupations such as construction, mining, sandblasting, and quarrying
Classic CXR findings: bilateral upper lobe nodular opacities with eggshell calcification of hilar lymph nodes, which is highly characteristic of silicosis (not pathognomonic; it is also seen in sarcoidosis)
Progressive massive fibrosis can occur
Complications include increased risk of tuberculosis (TB) (silicotuberculosis) and lung cancer
Why the others are wrong
Berylliosis — berylliosis is rare and resembles sarcoidosis; it does not produce eggshell calcification of hilar nodes
Asbestosis — asbestosis causes bilateral lower lobe interstitial fibrosis with pleural plaques, not upper lobe nodules or eggshell calcification
Coal worker's pneumoconiosis — requires coal mining exposure, which this construction worker lacks; eggshell nodal calcification is far more characteristic of silicosis
Sarcoidosis — tempting because it can produce upper-zone nodular opacities and occasionally eggshell calcification of hilar nodes, but it is a diagnosis of exclusion that requires ruling out occupational dust exposure, and this construction worker's likely silica exposure makes silicosis far more likely
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Berylliosis: aerospace, nuclear, electronics, ceramic and dental laboratory work
Cumulative exposure duration and intensity drive risk; smoking synergistic for lung cancer
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)
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) — a confirmed positive test establishes beryllium sensitization; sensitization + non-caseating granulomas on lung biopsy = chronic beryllium disease (the test that separates CBD from sarcoidosis)
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
Positive BeLPT + granulomas 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 (single dose, age ≥50 with chronic lung disease), Tdap
Pulmonary rehabilitation, supplemental oxygen for hypoxemia
Treat comorbid airflow obstruction (bronchodilators, ICS) in CWP
TB testing (IGRA or TST) in silicosis; treat LTBI (rifamycin-based regimen preferred); active silicotuberculosis gets standard 4-drug (RIPE) therapy
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 lung cancer screening when USPSTF criteria are met (age 50-80, ≥20 pack-years, current smoker or quit within 15 years); asbestos exposure adds risk but is not a standalone screening indication; awareness for mesothelioma (insidious chest pain, pleural effusion, pleural thickening)
Whole-lung lavage for severe acute silicosis (anecdotal, specialized centers)
Antifibrotic therapy for a progressive pulmonary fibrosis phenotype, including occupational ILDs (PF-ILD): nintedanib (FDA-approved; ATS 2022 conditional recommendation) or nerandomilast (FDA 2025); evidence for pirfenidone remains limited
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)
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 — test for latent TB (IGRA, or TST positive at ≥10 mm) and treat any positive result once active TB is excluded, preferably with a short rifamycin-based regimen (3HP, 4R, or 3HR).
ATS/ERS 2019 — The Occupational Burden of Nonmalignant Respiratory Diseases: An Official ATS/ERS Statement (Blanc et al., Am J Respir Crit Care Med 2019;199:1312-1334)
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 2015;41:5-15)
ATS 2014 — Chronic Beryllium Disease — ATS Official Statement (Balmes et al., Am J Respir Crit Care Med 2014)
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