Recurrent Langerhans cell histiocytosis (LCH) is cancer that has recurred (come back) after it has been treated. The cancer may come back in the same place or in other parts of the body. It often recurs in the bone, ears, skin, or pituitary gland. LCH often recurs the year after stopping treatment. When LCH recurs, it may also be called reactivation.
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