The high lipid content in the blood leads to excessive cytoplasm loading of lipids within histiocytes. The subsequent incomplete degradation of these lipids leads to the formation of cytoplasmic lipid pigments. High lipid content may also cause membrane abnormality of the hemopoietic cells which is recognized by macrophages and therefore, increased accumulation within the bone marrow. These lipid laden histiocytes appear<unk>  with May-Giemsa/PAS stain hence the name of<unk> -Blue Histocyte Syndrome.<unk>  is also seen in lipid disorders.
Sea-blue histiocytosis
Crystal-storing histiocytosis
X-type histiocytosis
Langerhans cell histiocytosis
Malignant histiocytosis
Non-X histiocytosis
Non-Langerhans cell histiocytosis
Langerhans cell sarcoma