title: Non-X histiocytosis
text: # 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
  