Abstract
Histiocytes are tissue macrophages or dendritic cells derived from the bone marrow. An abnormal proliferation of histiocytes is the defining features of the histiocytoses. Of these, the most well known is likely Langerhans cell histiocytosis, as it often presents in infancy and can mimic other more common infantile conditions such as diaper dermatitis and seborrheic dermatitis. Juvenile xanthogranuloma is the most common non-Langerhan cell histiocytosis, presenting typically as an erythematous, yellow or orange papule. The other histiocytoses are quite rare. Some, such as benign cephalic histiocytosis, are predominantly seen in children, whereas others, such as xanthoma disseminatum and multicentric reticulohistiocytosis, are predominantly seen in adults.
Published Version
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