Exudative pleurisy is characterized by an accumulation of effusion in the pleural cavity during inflammatory processes in the pleura and adjacent organs. According to the nature of effusion, exudative pleurisy is divided into serous-fibrinous, purulent, putrefactive, hemorrhagic, eosinophilic, cholesteric, and chyle. The most common cause of these pleurisy are tuberculosis, as well as pneumonia (para- or metapneumonic exudative pleurisy).