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Annals of the Rheumatic Diseases logoLink to Annals of the Rheumatic Diseases
. 1999 Apr;58(4):230–236. doi: 10.1136/ard.58.4.230

Remitting seronegative symmetrical synovitis with pitting oedema (RS3PE) syndrome: a prospective follow up and magnetic resonance imaging study

F Cantini 1, C Salvarani 1, I Olivieri 1, L Barozzi 1, L Macchioni 1, L Niccoli 1, A Padula 1, P Pavlica 1, L Boiardi 1
PMCID: PMC1752869  PMID: 10364902

Abstract

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.

 Keywords: RS3PE; polymyalgia rheumatica; pitting oedema; magnetic resonance imaging

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Figure 1  .

Figure 1  

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MRI of the hands of RS3PE syndrome. (A) Axial proton density section through the midpoint of the palm shows subcutaneous oedema in hand dorsum (black arrows). (B) Axial T2 weighted section through the midpoint of the palm shows fluid collection in the extensor synovial sheaths of the right hand (open arrows). (C) Axial T2 weighted section through the metacarpophalangeal joints shows fluid collection in the flexor synovial sheaths of the third digit of right hand (curved arrow) and joint effusion of the corresponding joint (large and small arrowheads).

Figure 2  .

Figure 2  

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MRI of the foot of RS3PE syndrome. (A) Sagittal T1 weighted section shows marked tenosynovitis of tibialis anterior tendon (black arrow). (B) Sagittal T2 weighted section shows marked tenosynovitis of tibialis anterior tendon (black arrow), ankle joint effusion extending into Kager's triangle (black/white arrow) and talonavicular joint effusion (black/white arrow). (C) Coronal T2 weighted section at the apex of the talus shows talonavicular joint effusion (black/white arrow), tenosynovitis of flexor hallucis longus tendon (double open arrowhead), tenosynovitis of flexor digitorum longus tendon (open arrowhead), tenosynovitis of tibialis posterior tendon (open white arrow) and tenosynovitis of peroneal tendons (black arrowhead). (D) Coronal T2 weighted section through the navicular bone shows marked tenosynovitis of tibialis anterior tendon (black arrow).

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