<prompt> Pseudochylous pleural effusion is most often seen inT.B.LymphomaCa.lungFilariasis  <response>: 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. 