NCIt related terms : MAS; Reactive Hemophagocytic Lymphohistiocytosis;
NCIt definition : A complication of rheumatic disease that is caused by excessive activation and uncontrolled
proliferation of T lymphocytes and well-differentiated macrophages. It is characterized
by fever, pancytopenia, liver insufficiency, coagulopathy and neurologic symptoms.;
Alternative definition : NICHD: A potentially fatal complication of rheumatic disease characterized by fever,
pancytopenia, hemophagocytosis, hyperferritinemia, liver insufficiency, coagulopathy
and neurologic symptoms.;