An accumulation of pus and gas or air in the pleural cavity.
Pus and gas or air in the pleural cavity. The condition can arise if gas is produced by gas-forming bacteria as part of an empyema or if air is introduced during attempts to drain the pus from an empyema. Alternatively a hydropneumothorax may become infected.
An accumulation of air and pus, or gas and pus, within the chest cavity.