RS3PE: Remitting Seronegative Symmetrical Synovitis with Pitting Edema
RS3PE stands for Remitting Seronegative Symmetrical Synovitis with Pitting Edema 1.
Breakdown of the Acronym
- Remitting: The condition typically resolves with treatment, often achieving drug-free remission 2
- Seronegative: Autoimmune serologies remain negative (rheumatoid factor, anti-CCP antibodies, ANA) 2
- Symmetrical Synovitis: Bilateral inflammation of joints, particularly affecting small joints of the hands and radiocarpal joints 3
- Pitting Edema: Characteristic edematous swelling of both hands (sometimes feet) that leaves an indentation when pressed 2, 4
Clinical Context
This is a rare inflammatory rheumatic disease primarily affecting older adults 2. The condition presents with rapidly progressing symmetric edematous swelling of both hands, accompanied by tenosynovitis 1, 2.
Key Clinical Features
- Acute onset of severe bilateral hand swelling extending to the wrists
- Pitting edema as the hallmark finding
- Negative autoimmune serology by definition
- Excellent response to glucocorticoids 2
Important Clinical Caveat
RS3PE can be a facultative paraneoplastic syndrome 2. When diagnosed, age-appropriate cancer screening should be performed, as it may be associated with underlying malignancies 1, 2, 3. The condition is specifically listed in EULAR guidelines as a relevant mimicking disease that must be considered when evaluating difficult-to-treat rheumatoid arthritis 1.