Histiocytosis
Alternate Names : Histiocytosis X, Langerhans cell histiocytosis, Eosinophilic granuloma, Pulmonary histiocytosis X, Nonlipid reticuloendotheliosis, Pulmonary Langerhans cell granulomatosis, Hand-Schuller-Christian disease, Letterer-Siwe disease
Definition
Histiocytosis is a general name for a group of syndromes that involve an abnormal increase in the number of immune cells called histiocytes. There are three major classes of histiocytoses: - Langerhans cell histiocytosis, which is also called histiocytosis X
- Malignant histiocytosis syndrome (now known as T-cell lymphoma)
- Non-Langerhans cell histiocytosis (also known as hemophagocytic syndrome)
This article focuses only on Langerhans cell histiocytosis (histiocytosis X).
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