A histiocyte is a type of immune cell. It destroys foreign substances to protect the body from infection.
Histiocytes do not travel through the blood. Instead, they remain in one part of the body.
Histiocytes are found in many organs and tissues, including the:
- Breast tissue
- Lymph nodes
An abnormal number of histiocytes leads to a disease called Langerhans cell histiocytosis (previously called histiocytosis X).
Crow MK. The innate immune system. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 39.
Hall JE, Hall ME. Resistance of the body to infection: I. Leukocytes, granulocytes, the monocyte-macrophage system, and inflammation. In: Hall JE, Hall ME, eds. Guyton and Hall Textbook of Medical Physiology. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 34.
Review Date 5/2/2020
Updated by: Stuart I. Henochowicz, MD, FACP, Clinical Professor of Medicine, Division of Allergy, Immunology, and Rheumatology, Georgetown University Medical School, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.