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