Hydropneumothorax

Hydropneumothorax is defined as the presence of both air and fluid within the pleural space. An upright chest x-ray will show air fluid levels. The horizontal fluid level is usually well defined and extends across the whole length of one of the hemithorax. This can be remembered by the 4 'S': straight line dullness, shifting dullness, splash, sound of coin. Iatrogenic: Introduction of air during pleural fluid aspiration in effusion Presence of a gas-forming organism Thoracic trauma Diagnosis can be via CXR. CT is better to outline borders of air fluid levels, however, CT has a greater radiation exposure. Treatment includes ICD (intercostal drainage) of fluid and air and treatment of underlying conditions.