Pleural effusion usually occurs in patients previously diagnosed with<unk>  arthritis, but it can also occur concurrently with or before the development of the joint manifestations of the disease (Graham, 1990; Chou and Chang, 2002). Patients may present with the signs of pleural effusion: dullness on percussion, diminished or absent breath sounds and vocal fremitus, and egophony at the level of the pleural liquid.
Rheumatoid pleuritis
Pleural empyema
Pulmonary sequestration
Tuberculous pericarditis
Lung abscess
Malignant pleural effusion
Cryptogenic organizing pneumonia
Tuberculosis