The pleura are the membranes that line the thoracic (chest) cavity and cover the lungs. There are several types of pleural diseases, including: Pleurisy - an infection of the pleural cavity. Viral infection is the most common cause of pleurisy.
Pleural Effusion
A pleural effusion is a buildup of fluid in the pleural space, an area between the layers of tissue that line the lungs and the chest cavity. It may also be referred to as effusion or pulmonary effusion and sometimes as “water on the lungs.” This excess fluid can impair breathing by limiting the expansion of the lungs. The most common cause of pleural effusion is congestive heart failure. Lung diseases, like COPD, tuberculosis, and acute lung injury, cause pneumothorax. Injury to the chest is the most common cause of hemothorax.