What is Syndromes, Infection-Associated Hemophagocytic?

Group of disorders which feature accumulations of active histiocytes and lymphocytes, but where the histiocytes are not Langerhans cells. The group includes hemophagocytic lymphohistiocytosis, infection-associated hemophagocytic syndrome, sinus histiocytosis, xanthogranuloma, reticulohistiocytoma, juvenile xanthoma, xanthoma disseminatum, as well as the lipid storage diseases (sea-blue histiocyte syndrome and Niemann-Pick disease).