<prompt> Answer this question truthfullyWhat is the definition of Langerhans cell histiocytosis?  <response>: <reason> Seven Part Video SeriesTemplate:Hematologyv t e Myeloid Hematological malignancy leukemia histology ICD-O 9590-9989, C81-C96, 200-208 CFU-GM and other granulocytes Template:Navbox subgroup MEP Template:Navbox subgroup CFU-Mast Mastocytoma Mast cell leukemia, Mast cell sarcoma, Systemic mastocytosis Multipleunknown AML Acute panmyelosis with myelofibrosis, Myeloid sarcoma MP Myelofibrosis Acute biphenotypic leukaemia See also hematology, lymphoid malignancyTemplate:WikiDoc Sources 