Resembling chyle.
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In pleural fluids, chylous effusions are milky white or yellow-bloody and indicate damage or obstruction to the thoracic duct secondary to trauma, malignancy, or congenital abnormality; pseudochylous effusions are also milky or green with a metallic sheen, contain cholesterol crystals and indicate chronic inflammation.
In the case of a pseudochylous effusion of pleural fluid, cholesterol crystals may be seen.