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“The cells of histiocytosis X [HX] have been designated “histiocytes” but the “ordinary” histiocytes encountered in healthy skin, in histiocytoma or various granulomatous processes are devoid of the granules. It could be inferred that histiocytes produce the granules only in certain proliferative conditions (for instance, in HX) but this would imply that intraepidermal Langerhans’ cells […]