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Pleurisy. Coloured frontal chest X-ray of a patient with pleurisy, an inflammation (blue, left) of the membranes that line the chest cavity and lungs (the pleura). Inflammation of the pleura leads to the lungs rubbing against the chest wall, which causes sharp pain when breathing. Fluid may accumulate in the space between the membranes (pleural effusion), which relieves the pain of the pleurisy and may cause the patient to think they are recovering. Treatment is of the underlying cause, which in this case is tuberculosis, a contagious bacterial infection of the lungs.
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