Background: Langerhans cell histiocytosis (LCH) comprises a diverse group of disorders where pathologic Langerhans cells accumulate in a variety of organs.

• 摘要背景：兰格罕氏细胞组织细胞增生病是一群由兰格罕氏细胞在不同器官的浸润所造成的多样化的疾病。