<unk>  <unk>  is an uncommon hematologic disorder in which the immune system produces too many activated immune cells (lymphocytes) called T cells, natural killer cells, B cells, and macrophages (histiocytes).  Excessive amounts of immune system proteins called cytokines are also produced.
Hemophagocytic lymphohistiocytosis
Peripheral T cell lymphoma
Langerhans cell histiocytosis
Faisalabad histiocytosis
Angioimmunoblastic T-cell lymphoma
T-cell large granular lymphocyte leukemia
Aggressive NK-cell leukemia
Anaplastic large cell lymphoma