Abstract
Objective
To retrospectively analyze the differences in musculoskeletal ultrasound (MSUS) findings to distinguish patients with remitting seronegative symmetrical synovitis with pitting edema (RS3PE) syndrome and patients with elderly-onset rheumatoid arthritis (EORA).
Methods
We consecutively recruited patients with RS3PE syndrome (n = 7) and EORA (n = 22) who underwent pre-treatment MSUS of both hands. Synovial hypertrophy and vascularity of articular synovitis and those of tenosynovitis of the digital flexor tendons and the carpal extensor tendon were evaluated by gray-scale and power Doppler, respectively on a semi-quantitative scale (0–3). The presence/absence of intra-articular synovial effusion, bone erosion, peritendinitis of the digital extensor tendon, and subcutaneous edema were noted.
Results
Compared to the EORA group, mild articular synovitis was observed more extensively, and the frequency of intra-articular synovial effusion was significantly higher in the RS3PE syndrome group. Severe articular synovial hypertrophy was more frequent in the EORA group compared to the RS3PE syndrome group, and bone erosion was observed in some EORA cases. Tenosynovitis of the digital flexor tendon was more frequent and severe in the RS3PE syndrome group compared to the EORA group. Although the frequency and severity of tenosynovitis of the carpal extensor tendon were similar in the two groups, digital extensor tendon peritendinitis was more frequent in the RS3PE syndrome group.
Conclusion
To distinguish patients with RS3PE syndrome from those with EORA, it is important to evaluate not only intra-articular lesions but also extra-articular lesions by MSUS.
Key Points • We retrospectively compared MSUS findings of RS3PE syndrome and EORA in detail. • MSUS revealed extensive intra- and extra-articular inflammation in patients with RS3PE syndrome • Evaluating not only intra-articular lesions but also extra-articular lesions helps distinguish RS3PE syndrome and EORA |
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Abbreviations
- ACPA:
-
Anti-cyclic citrullinated peptide antibody
- CRP:
-
C-reactive protein
- DMARD:
-
Disease-modifying antirheumatic drug
- DRU:
-
Distal radio-ulna
- ECU:
-
Extensor carpal ulnaris
- EORA:
-
Elderly-onset rheumatoid arthritis
- ESR:
-
Erythrocyte sedimentation rate
- GS:
-
Gray-scale
- IP:
-
Interphalangeal
- IQR:
-
Interquartile range
- JCR:
-
Japan College of Rheumatology
- MCP:
-
Metacarpophalangeal
- MSUS:
-
Musculoskeletal ultrasound
- MRI:
-
Magnetic resonance imaging
- PD:
-
Power Doppler
- PIP:
-
Proximal interphalangeal
- RA:
-
Rheumatoid arthritis
- RC-IC:
-
Radiocarpal-intercarpal
- RF:
-
Rheumatoid factor
- RS3PE:
-
Remitting seronegative symmetrical synovitis with pitting edema
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The study was approved by the Institutional Review Board (reference no. 10062546) of Nagasaki University Hospital.
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Kawashiri, Sy., Suzuki, T., Okada, A. et al. Differences in musculoskeletal ultrasound findings between RS3PE syndrome and elderly-onset rheumatoid arthritis. Clin Rheumatol 39, 1981–1988 (2020). https://doi.org/10.1007/s10067-020-04931-w
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DOI: https://doi.org/10.1007/s10067-020-04931-w