<unk>  is a condition in which cancer causes an abnormal amount of fluid to collect between the thin layers of tissue (pleura) lining the outside of the lung and the wall of the chest cavity. Lung cancer and breast cancer account for about 50-65% of<unk> s. Other common causes include pleural mesothelioma and lymphoma.
Malignant pleural effusion
Pleural empyema
Lung abscess
Atypical pneumonia
Lobar pneumonia
Viral pneumonia
Parapneumonic effusion
Pneumonia of unknown etiology 