hemophagocytic lymphohistiocytosis
(HEE-moh-FA-goh-SIH-tik LIM-foh-HIS-tee-oh-sy-TOH-sis)
A rare disorder
          in which histiocytes and lymphocytes (types of white blood
          cells) build up in organs including the skin, spleen, and
          liver, and destroy other blood cells.
          Hemophagocytic lymphohistiocytosis may be inherited or caused by
          certain conditions or diseases, including infections,
          immunodeficiency (inability of the body to fight
          infections), and cancer. Also called HLH.