Pulmonary cavity with black sputum in COVID-19-Pneumoconiosis: a case report

Occupational dust exposure should not be ignored when treating patients with hollow lungs and black sputum. Pneumoconiosis is always diagnosed at an advanced stage, either as a milia nodular disease in chest imaging, or it progresses to PMF (progressive bulk fibrotic), with or without cavitation. There are currently no reported cases of pneumoconiosis combined with COVID-19 infection. Patients with pneumoconiosis have become susceptible to COVID-19 infection due to pulmonary interstitial fibrosis and low immunity. PMF cases of COVID-19 are atypical, and their clinical symptoms, laboratory examinations, and imaging manifestations are allIt exhibits atypical properties, and because the fungal test is negative, infection with COVID-19 may accelerate the production of unexplained tracheal mucus and black sputum in microbiological examinations.