Langerhans cell histiocytosis is an idiopathic reticuloendothelial proliferative disorder involving the Langerhans cell, an immature dendritic cell of bone marrow origin.

朗格·汉斯组织细胞增生症是一个特发性网状组织细胞增生性病变，主要累及朗格·汉斯细胞，一种起源于骨髓的幼稚树突细胞。

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The prognosis of this heritable disorder is poor and bone marrow transplantation is the only effective treatment.

这种遗传性疾病的预后较差，目前骨髓移植是唯一有效的治疗方法。

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In long-term use it carries a one in 30, 000 risk of a serious side effect - the bone marrow disorder aplastic anaemia.

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