Pseudochylous pleural effusion is most often seen in

Most common cause of pseudochylous pleural effusion is tuberculous pleurisy. • Chyliform pleural effusion, often called pseudochylous or cholesterol effusion, is a high-lipid effusion that is not chylous. • The most common cause of this pleural reaction is tuberculous pleurisy, but it has also been described in association with rheumatoid arthritis. • The presence of a fat-fluid level within the pleural space is unique to pseudochylous effusion.