pyopneumothorax

noun

pyo·​pneu·​mo·​tho·​rax -ˌn(y)ü-mə-ˈthō(ə)r-ˌaks, -ˈthȯ(ə)r- 

plural pyopneumothoraxes or pyopneumothoraces -ˈthō-rə-ˌsēz 

: a collection of pus and air or other gas in the pleural cavity