Chylotorax: Accumulation of chyle in the pleural cavity. From the Greek “Chylos” which means juice. • Pleural fluid triglycerides > 110 mg/dL or presence of chylomicrons • Appearance can be milky white, serous, or serosanguineous • Trauma and malignancy are the leading causes

Light's criteria incorrectly categorizes a significant number of effusions as exudates. These exudative effusions with transudative etiologies are termed “pseudoexudates”. Common causes include diuretic therapy, traumatic pleural taps, and coronary artery bypass grafting.