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Inside the ribcage, the lungs are surrounded by a moist, double-layered membrane called the pleura. Normally, there is a small amount of fluid which lubricates the surfaces of the pleural membranes. A pleural effusion is an abnormal accumulation of fluid between the membranes.

There are two types of effusions that can develop. Transudative effusions are caused by an underlying disease or disorder that disrupts the normal pressures in the lungs, compromising the ability ... more