Papers of the Week

Sympathetic joint effusion (SJE) and sympathetic synovial effusion (SSE) are recognized as causes of noninflammatory effusion with <2000 white blood cell (WBC) WBC/mm in the joint and bursa, respectively. Data on normal range SJE/SSE with <200 WBC/mm are unknown. We aimed to investigate the incidence, disease characteristics, and associated triggers of normal range SJE/SSE and to propose diagnostic criteria.