Synovial fluid. A macrophage that has phagocytosed one or more neutrophils in a patient with reactive arthritis. This finding is not specific for reactive arthritis.
✅ Reactive arthritis is an inflammatory joint disease that manifests several days or weeks after a gastrointestinal or genitourinary infection. It is also described as the classic triad of arthritis, urethritis, and conjunctivitis. However, most patients do not exhibit the classic triad. Today, this disorder is considered to be caused by an abnormal autoimmune response to a gastrointestinal or genitourinary infection caused by Salmonella, Shigella, Campylobacter, or Chlamydia.
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