Silicosis

Silicosis is a chronic, progressive, fibrotic lung disease resulting from prolonged inhalation of respirable crystalline silica particles encountered by individuals working in sandblasting, mining, glass manufacturing, foundry operations, etc. Once inhaled, silica particles deposit deeply within the alveoli, triggering alveolar macrophages to release pro-inflammatory cytokines, thereby inciting persistent inflammation and progressive fibrosis. Over time, this leads to significant lung parenchymal damage and impaired gas exchange.

Clinically, silicosis presents with a gradual onset of exertional dyspnea, chronic productive or non-productive cough, fatigue, and progressive hypoxemia. Symptoms typically manifest years after initial exposure, depending upon duration and intensity. Advanced disease is characterized by severe respiratory compromise, reduced exercise tolerance, and potential respiratory failure.

Radiographically, silicosis classically demonstrates diffuse, bilateral nodular opacities, predominantly in the upper lobes on chest imaging (as shown in the coronal chest CT scan video). These nodules may coalesce with disease progression, forming conglomerate masses termed progressive massive fibrosis (PMF). PMF significantly worsens lung function and carries a poor prognosis. High-resolution CT imaging may reveal characteristic findings, including ground-glass opacities, nodular densities, and occasionally calcified lymph nodes (“eggshell calcification”).

Silicosis notably increases susceptibility to pulmonary tuberculosis, fungal infections, and lung cancer due to impaired pulmonary immune defenses. Effective management primarily emphasizes preventive measures, including implementing workplace safety protocols such as engineering controls, proper ventilation systems, wet-cutting techniques, and appropriate personal protective equipment (PPE) such as respirators.

Treatment for silicosis remains supportive, emphasizing symptom management, pulmonary rehabilitation, supplemental oxygen therapy, and vigilance for associated complications. Lung transplantation may be considered in selected patients with severe, advanced disease.