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  • Langerhans
  • Langerhans cell histiocytosis was selected by the Histiocyte Society to replace the older, less specific term histiocytosis X. Histiocytosis X encompassed three entities known as eosinophilic granuloma, Hand-Schuller-Christian disease, and Letterer-Siwe disease that were characterized by the accumulation of histiocytes. (webmd.com)