Pleural Effusion

Pleural effusion refers to excess fluid in the pleura, the fluid-filled space that surrounds the lungs. It can be serous fluid (hydrothorax), blood (hemothorax), chyle (chylothorax), or pus (empyema). It can be transudative or exudative, as distinguished by Light's criteria. The fluid can be free flowing or loculated.

Case #1. Patient was positioned on side to assess for pleural effusion loculation, seen on right side.