Non-X histiocytosis
# Non-X histiocytosis

Non-X histiocytoses are a clinically well-defined group of cutaneous syndromes characterized by infiltrates of monocytes/macrophages, as opposed to X-type histiocytoses in which the infiltrates contain Langerhans $cells.^{:714}$ Conditions included in this group $are:^{:714–20}$

   * Juvenile xanthogranuloma

   * Benign cephalic histiocytosis

   * Generalized eruptive histiocytoma

   * Xanthoma disseminatum

   * Progressive nodular histiocytosis

   * Papular xanthoma

   * Hereditary progressive mucinous histiocytosis

   * Reticulohistiocytosis

   * Indeterminate cell histiocytosis

   * Sea-blue histiocytosis

   * Erdheim–Chester disease
