title: Classical rheumatoid arthritis associated with nondeforming relapsing polychondritis.
abstract: Two patients with classical rheumatoid arthritis and a mild nondeforming relapsing polychondritis are presented. DR4 antigen and depressed C4 levels were found and possible autoimmune mechanisms are discussed. The need for specific questioning to detect this rare association is proposed.
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000097:blood / Q000150:complications* / Q000276:immunology; D003181:Complement C4 / Q000032:analysis; D005260:Female; D006684:HLA-DR Antigens / Q000032:analysis; D015804:HLA-DR4 Antigen; D006801:Humans; D008297:Male; D008875:Middle Aged; D011081:Polychondritis, Relapsing / Q000097:blood / Q000150:complications* / Q000276:immunology
chemical_list: D003181:Complement C4; D006684:HLA-DR Antigens; D015804:HLA-DR4 Antigen