nonhereditary periodic arthritis syndromes. Why are they grouped together?
- • Intermittent hydrarthrosis.
- • Palindromic rheumatism.
- • Eosinophilic synovitis.
- • Remitting seronegative symmetrical synovitis with pitting edema (RS3PE) syndrome.
These syndromes are grouped together because they share four features: (1) intermittent arthritis followed by periods of remission; (2) complete resolution between attacks; (3) rare development of joint damage; and (4) unknown cause. These disorders should not be confused with periodic fever syndromes.
