what is hemophagocytic lymphohistiocytosis
The genetics, clinical features, and diagnosis of HLH are presented separately. (See Clinical features and diagnosis of hemophagocytic lymphohistiocytosis .). OVERVIEW AND INDICATIONS FOR TREATMENT. Hemophagocytic lymphohistiocytosis (HLH) is a progressive syndrome of unchecked immune activation and tissue damage. If left untreated, patients with HLH survive for only a few months, due to progressive multi-organ failure.