CTICasesSilicosis with Superimposed Idiopathic Pulmonary Fibrosis (IPF)
Imaging findings
High-resolution chest CT demonstrates progressive massive fibrosis in the upper lobes characterized by mass-like conglomerate soft tissue opacities, extensive mediastinal and hilar lymphadenopathy with eggshell and amorphous calcifications, and diffuse centrilobular nodules. At the lung bases, there is a distinct pattern of subpleural, peripheral-predominant reticulation, traction bronchiectasis, and honeycombing.
Key takeaways
Silicosis is a classic occupational pneumoconiosis caused by silica dust inhalation (common in sandblasters) that typically presents with upper-lobe-predominant nodules and progressive massive fibrosis. However, patients with prior silica exposure can occasionally develop a superimposed idiopathic pulmonary fibrosis (IPF) manifesting as a typical interstitial pneumonia (UIP) pattern at the lung bases. Distinguishing these dual pathologies is clinically important as they have different therapeutic implications and prognoses.
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