This type of pleural effusion is often caused by pneumonia, tuberculosis, or some other lung infection. It is characterized by excess liquid leaking across damaged blood vessels into the pleura. Protein, blood, bacteria, or inflammatory cells can also seep into the pleural space. Depending on the amount of fluid present, and the severity of the impact on the breathing or other accompanying symptoms, the patient affected by the condition may need medical treatment. Lung cancer can also cause this condition as well as other types of cancers that spread to the chest region. Autoimmune conditions such as rheumatoid arthritis or lupus can manifest as a pleural effusion.
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