title: Nonrheumatoid pleural effusions in patients with rheumatoid arthritis.
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010996:Pleural Effusion / Q000032:analysis*