Relapsing polychondritis: a chameleon among orphan diseases Translated title: Rezidivierende Polychondritis: ein Chamäleon unter den seltenen Erkrankungen

Relapsing polychondritis, an uncommon, chronic, multisystem disorder characterized by recurrent episodes of inflammation of cartilaginous tissues, can be life-threatening, debilitating, and difficult to diagnose. This review is based on the authors' experience with 36 patients with relapsing polychondritis who were followed from 1980 to 1997, 30 patients located elsewhere who completed a detailed questionnaire and interview, and a perusal of English-language textbooks and papers located by a systematic search of the MEDLINE database. Relapsing polychondritis can present in a highly ambiguous fashion; therefore, in the authors' series, the mean delay from the time medical attention was sought because of symptom onset until diagnosis was 2.9 years. Although prednisone was the main form of treatment, methotrexate seemed to be of additional value. Survival was much more favorable than previously thought. Greater awareness of relapsing polychondritis would probably lead to earlier diagnosis and better outcomes.

Relapsing polychondritis is a disorder of unknown cause characterized by the destruction of cartilage. To test the hypothesis that immunologic mechanisms are involved in the pathogenesis of relapsing polychondritis, we analyzed the serum of 15 patients for the presence of antibodies to cartilage. Antibodies to Type II (cartilage) collagen were found in the serum of five patients at the time of acute symptoms. No antibodies were detected either to cartilage proteoglycan or to other collagen types. The antibodies were detected at the onset of the disease and their titers appeared to correlate with severity of disease. Circulating immune complexes were also detected in the serum of these patients. Our findings support an immunologic involvement in this condition.