Sandbox: Langerhans
- Langerhans cell histiocytosis may be classified according to the the extent of organs involvement into 4 groups: pulmonary Langerhans cell histiocytosis, unifocal Langerhans cell histiocytosis, multifocal unisystem Langerhans cell histiocytosis, and multifocal multisystem Langerhans cell histiocytosis.