Pleural effusion

• Facts:
  Abnormal collection of fluid in the pleural space
  Classified as either transudative or exudative
  
• Notes:
  Transudate
  
  (increase in pulmonary capillary wedge pressure (PCWP) or decrease in oncotic pressure)
  
  CHF
  Cirrhosis
  Nephrotic syndrome
  
  Exudate ( Light's criteria )
  
  (increase in vascular permeability)
  
  PNA ( parapneumonic effusion )
  TB
  Malignancy
  Pulmonary embolism
  Collagen vascular disease ( rheumatoid arthritis , SLE)
  Pancreatitis
  Trauma