| http://www.w3.org/ns/prov#value | - Langerhans cell histiocytosis (LCH) is a rare disorder that occurs when your child has too many of a certain type of white blood cell called a Langerhans cell.These cells normally reside in the skin and help fight infections and destroy certain foreign substances in the body.In LCH, these cells accumulate on bones and other parts of the body, particularly the head and neck, causing a wide range of
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