1) Empyema in a pleural cavity 
presence of pus in the pleural cavity, between the membrane lining the thoracic cage and the membrane covering the lung. The most common cause is ...
Empyema in a pleural cavity. ... (05 Mar 2000) ... 
(pi″o-tho´raks) empyema (def. 2).
Type: Term Pronunciation: pī′ō-thō′raks Definitions: 1. Empyema in a pleural cavity.
Accumulation of pus within the chest; also called thoracic empyema.
empyema, pyothorax The collection of pus in a body cavity; especially in the pleural cavity (the thin serous membrane around the lungs and inner walls of the chest).