aspiration of fluid from the pleural space is
Thoracentesis Thoracentesis /ˌθɔːrəsɪnˈtiːsɪs/, also known as thoracocentesis (from the Greek θώραξ thōrax "chest, thorax"—GEN thōrakos—and κέντησις kentēsis "pricking, puncture") or pleural tap (from the Greek πλευρά pleura or πλευρόν pleuron "side, rib"), is an invasive procedure to remove fluid or air from the pleural space for diagnostic or therapeutic purposes. A cannula, or hollow needle, is carefully introduced into the thorax, generally after administration of local anesthesia. The procedure was first performed by Morrill Wyman in 1850 and then described by Henry Ingersoll Bowditch in 1852.[2]