A histiocyte is a type of immune cell that eats foreign substances in an effort 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 following:
An abnormal number of histiocytes leads to a disease called Langerhan’s cell histiocyosis (previously called histiocytosis X ).
Goronzy JJ, Weyand CM. The innate and adaptive immunesystems. In: Goldman L, Schafer AI, eds. . 24th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 44.