Abstract
Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease with frequent hematologic complications, including leukopenia, thrombocytopenia, autoimmune hemolytic anemia, and, in rare cases, macrophage activation syndrome (MAS). MAS, a severe hyperinflammatory condition, presents diagnostic challenges due to its overlap with SLE flares, infections, and drug-related adverse effects. This case report presents a 22-year-old female with SLE who experienced clinical deterioration following methotrexate initiation, manifesting as fever, pancytopenia, and transaminitis. Differential diagnoses were considered, including MAS, infection, and methotrexate toxicity. Prompt recognition and management with corticosteroids and immunoglobulins led to clinical improvement, underscoring the complexity of diagnosing and treating MAS in SLE patients.
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