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Objective: To determine the clinical characteristics of patients with "pure" remitting seronegative symmetrical synovitis with pitting oedema (RS3PE) syndrome, and to investigate its relation with polymyalgia rheumatica (PMR). Magnetic resonance imaging (MRI) was used to describe the anatomical structures affected by inflammation in pure RS3PE syndrome.Methods: A prospective follow up study of 23 consecutive patients with pure RS3PE syndrome and 177 consecutive patients with PMR diagnosed over a five year period in two Italian secondary referral centres of rheumatology. Hands or feet MRI, or both, was performed at diagnosis in 7 of 23 patients.Results: At inspection evidence of hand and/or foot tenosynovitis was present in all the 23 patients with pure RS3PE syndrome. Twenty one (12%) patients with PMR associated distal extremity swelling with pitting oedema. No significant differences in the sex, age at onset of disease, acute phase reactant values at diagnosis, frequency of peripheral synovitis and carpal tunnel syndrome and frequency of HLA-B7 antigen were present between patients with pure RS3PE and PMR. In both conditions no patient under 50 was observed, the disease frequency increased significantly with age and the highest frequency was present in the age group 70-79 years. Clinical symptoms for both conditions responded promptly to corticosteroids and no patient developed rheumatoid arthritis during the follow up. However, the patients with pure RS3PE syndrome were characterised by shorter duration of treatment, lower cumulative corticosteroid dose and lower frequency of systemic signs/symptoms and relapse/recurrence. Hands and feet MRI showed evidence of tenosynovitis in five patients and joint synovitis in three patients.Conclusion: The similarities of demographic, clinical, and MRI findings between RS3PE syndrome and PMR and the concurrence of the two syndromes suggest that these conditions may be part of the same disease and that the diagnostic labels of PMR and RS3PE syndrome may not indicate a real difference. The presence of distal oedema seems to indicate a better prognosis. [ABSTRACT FROM AUTHOR]

There are no standardised diagnostic criteria for polymyalgia rheumatica. The combination of persistent pain (at least 1 month) with marked morning stiffness in at least 2 of the neck, shoulder or pelvic girdle is characteristic of polymyalgia rheumatica. The other criteria are age >50 years, erythrocyte sedimentation rate (ESR) >40 mm/hour, rapid response to corticosteroids and an absence of other diseases capable of causing the musculoskeletal symptoms. A normal ESR does not exclude a diagnosis of polymyalgia rheumatica. Diagnostic temporal artery biopsy is recommended in all patients suspected of having giant cell arteritis. The segment of temporal artery with abnormality on physical examination should be biopsied. The drugs of choice in the treatment of polymyalgia rheumatica/giant cell arteritis are corticosteroids. An initial prednisone dosage of 40 to 60 mg/day is adequate in almost all cases of giant cell arteritis. Higher dosages and/or intravenous pulse methylprednisolone can be tried on patients with partial response or with recent visual loss. Polymyalgia rheumatica in the absence of giant cell arteritis requires an initial dose of prednisone 10 to 20 mg/day. In some cases of mild polymyalgia rheumatica, a short course of nonsteroidal anti-inflammatory drugs may be tried. Long term corticosteroid therapy in polymyalgia rheumatica and giant cell arteritis is complicated by serious adverse effects in between 48 and 65% of patients. Vertebral fractures and infections are among the most dangerous and frequent complications. Although there are limited data on the use of cytotoxic or immunosuppressive drugs, such as methotrexate, azathioprine and cyclosporin, in these indications, they might be effective either in sparing corticosteroids or in treating patients who do not respond to treatment with corticosteroids. [ABSTRACT FROM AUTHOR]