[Histiocytoses and neoplasms of the macrophage-dendritic cell lineages. Comparison of recent WHO classification published 2017 and classification of Histiocyte Society published 2016].

The histiocytoses are rare disorders characterized by the accumulation of cells thought to be derived from dendritic cells or macrophages. Their clinical behaviour ranges from mild to disseminated and, sometimes, life-threatening forms. The incidence of this diseases is much smaller, then the incidence of diseases derived from lymphocytic or myeloid lineage. Langerhans cell histiocytosis is most frequent disease from this group. The last version of WHO classification from 2017 and last version of classification published by Histiocyte Society is summarised in this paper.