Syndrome of remitting seronegative symmetrical synovitis with pitting edema: a case series.

Remitting Seronegative Symmetrical Synovitis with Pitting Edema (RS3PE) is a rare clinical entity that is easily missed due to lack of knowledge. It was formerly considered as a subset of rheumatoid arthritis (RA), but is now regarded as a distinct disease/syndrome. The diagnosis of RS3PE is not easy, as it is always hindered by the lack of definite diagnostic criteria and presence of other much common rheumatological disorders that mimic it. We report a series of seven cases that attended our clinic in the last year, which highlight the salient features of the disease. The disease was found to have a heterogeneous presentation. Immunogenetic, clinical, laboratory, radiological, and possible etiological factors and associations with the neoplasm are described, as also other peculiar presentations. Finally, a comparison with other common rheumatological disorders is made to alert the clinician about this rare, but easily treatable disease.