CT scan showing<unk>  infiltrating peri-orbital tissue (arrowed). A patient with Hand–Schüller–Christian disease which is a subtype of<unk> .<unk>  provokes a non-specific inflammatory response, which includes fever, lethargy, and weight loss. Organ involvement can also cause more specific symptoms. * Bone: The most-frequently seen symptom in both unifocal and multifocal disease is painful bone swelling. The skull is most frequently affected, followed by the long bones of the upper extremities and flat bones. Infiltration in hands and feet is unusual. Osteolytic lesions can lead to pathological fractures. * Skin: Commonly seen are a rash which varies from scaly erythematous lesions to red papules pronounced in intertriginous areas. Up to 80% of<unk>  patients have extensive eruptions on the scalp. * Bone marrow: Pancytopenia with superadded infection usually implies a poor prognosis. Anemia can be due to a number of factors and does not necessarily imply bone marrow infiltration. * Lymph node: Enlargement of the liver in 20%, spleen in 30% and lymph nodes in 50% of<unk>  cases. * Endocrine glands: Hypothalamic pituitary axis commonly involved. Diabetes insipidus is most common. Anterior pituitary hormone deficiency is usually permanent. * Lungs: some patients are asymptomatic, diagnosed incidentally because of lung nodules on radiographs; others suffer from chronic cough and shortness of breath. * Less frequently gastrointestinal tract, central nervous system, and oral cavity.
Langerhans cell histiocytosis
X-type histiocytosis
Sea-blue histiocytosis
Malignant histiocytosis
Crystal-storing histiocytosis
Non-X histiocytosis
Progressive nodular histiocytosis
Langerhans cell sarcoma