Expected headings
"This is a basic article for medical students and other non-radiologists"
"Clinical features"
"Treatment and prognosis"
"Exudates are caused by disruption of the pleural membrane which results in a reduction in the ability to absorb pleural fluid. This may be secondary to infection (pneumonia), inflammation (e.g. rheumatoid arthritis), or neoplasia (e.g. lung cancer)."