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  • This condition is caused by slow-growing conglomeration of dust particles and collagen deposition in individuals (mostly coal workers) heavily exposed to inorganic dust. Progressive massive fibrosis manifests as masslike lesions, usually bilateral and innthe upper lobes. Background nodular opacities reflect accompanying pneumoconiosis, with or without emphysematous destruction adjacent to the massive fibrosis. Lesions similar to progressive massive fibrosis sometimes occur in other conditions, such as sarcoidosis and talcosis. [PMID:18195376]
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