Lungs and pulmonary pleural effusion, illustration - stock illustration

Illustration of the lungs, one of them affected by pleural effusion (left). This is the accumulation of fluid in the space between the lungs and the chest wall (the pleural space). It can be caused by conditions such as infections, tumors, trauma, heart failure, or liver disease. Symptoms include shortness of breath and chest pain, but some effusions may be asymptomatic