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Comparison of baseline laboratory findings of macrophage activation syndrome complicating systemic juvenile idiopathic arthritis and multisystem inflammatory syndrome in children

Recently, multisystem inflammatory syndrome in children (MIS‐C) has been recognized in association with coronavirus disease 2019 as a cytokine storm syndrome. MIS‐C presents with symptoms similar to Kawasaki disease and macrophage activation syndrome (MAS). We aimed to better understand this cytokine storm syndrome by comparing the initial laboratory findings of MIS‐C and MAS.