Eosinophilic arthritis refers to an acute arthritis with an excess of eosinophils in the aspirated joint fluid.
Criteria:
(1) clinical acute arthritis, which may be polyarticular
(2) eosinophilia in the aspirated fluid from an affected joint (either > 700 per µL or > 11% of the differential count)
Some patients may have:
(1) asthma
(2) urticarial skin rash
(3) eosinophilia in the peripheral blood
(4) Charcot-Leyden crystals in the joint fluid
Some patients have a probable explanation:
(1) parasitic infection (toxocariasis, filariais, other)
(2) allergic drug reaction
(3) allergic food reaction
(4) other allergic reactions
(5) hyperosinophilic syndrome
Some patients do not have a cause identified despite a complete and extensive workup.
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Specialty: Immunology/Rheumatology, Surgery, orthopedic, Infectious Diseases