from Section VI - Histiocytic Disorders and Neoplasms
Published online by Cambridge University Press: 25 January 2024
Hemophagocytic lymphohistiocytosis (HLH) is a complex, life-threatening clinical syndrome of systemic hyperinflammation. The syndrome is often diagnosed based on the presence of clinical signs and symptoms that were included as diagnostic criteria for HLH by the Histiocyte Society in clinical treatment trials (1, 2). The criteria include fever, splenomegaly, cytopenias, hypertriglyceridemia and/or hypofibrinogenemia, observation of hemophagocytosis, decreased function of natural killer (NK) cells, elevated ferritin, and elevated soluble interleukin-2 (IL-2) receptor levels (Table 27.1). Other complications of HLH that are not part of the criteria include central nervous system (CNS) involvement in 30–70% of patients (3, 4), as well as hepatitis or acute liver failure. Rarely, isolated CNS disease can also occur (5). The syndrome of HLH can be caused by a wide variety of etiologies, and it is imperative that clinicians bear this in mind when the clinical diagnosis is suspected (6).
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