Langerhans cell histiocytosis

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Langerhans cell histiocytosis (lang-er-hans) n. overgrowth of cells of the reticuloendothelial system. This includes disorders previously called histiocytosis X, including eosinophilic granuloma, Hand-Schüller-Christian disease, and Letterer-Siwe disease. [ P. Langerhans (1847–88), German physician and anatomist]

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