PLEURAL EFFUSION Under abnormal circumstances, fluid can accumulate within the pleural space.An increase in Trachea (windpipe) hydrostatic pressure,a decrease in oncotic pressure,decreased Pleura (lung lining) pressure in the pleural space, increased pleural membrane Lung permeability,or obstruction of pleural lymphatics will promote Pleural effusion (fluid between pleural fluid accumulation. pleural space) 第 一 部 分 Under abnormal circumstances, fluid can accumulate within the pleural space. An increase in hydrostatic pressure, a decrease in oncotic pressure, decreased pressure in the pleural space, increased pleural membrane permeability, or obstruction of pleural lymphatics will promote pleural fluid accumulation. PLEURAL EFFUSION