<unk>  is a form of malignant histiocytosis. It should not be confused with<unk>  cell histiocytosis, which is cytologically benign.<unk>  is known to transform into leukemia. It can present in the lung, but such cases are rare.
Langerhans cell sarcoma
Angiomatoid fibrous histiocytoma
Lymphoepithelioma
Multinucleate cell angiohistiocytoma
Mast cell sarcoma
Progressive nodular histiocytoma
Reticulohistiocytoma
Sclerosing epithelioid fibrosarcoma