Histoplasmosis is a fungal infection that can cause swelling, inflammation, and, sometimes, small semi-opaque or calcified nodules on the lungs. However, histoplasmosis does not always cause symptoms.

Empyema is an exudative effusion (an excessive collection of protein-rich fluid) accompanied by pus in the pleural cavity. The pleural space Is also known as the pleural cavity or intrapleural space ...