Rheumatoid pleural effusion presenting as pseudochylothorax in a patient without previous diagnosis of rheumatoid arthritis.

Background: Rheumatoid pleurisy rarely occurs before a diagnosis of rheumatoid arthritis (RA). It is the second leading cause of pseudochylothorax, but there are few reports of RA-associated pseudochylothorax.

Case: A 50-year-old man presented to our hospital with an undiagnosed exudative pleural effusion.