Lymphatic Diseases [Disease/Finding] Histiocytosis [Disease/Finding] C6766 N0000003294 1022662 C0019618 D015614 Histiocytosis Histiocytosis General term for the abnormal appearance of histiocytes in the blood. Based on the pathological features of the cells involved rather than on clinical findings, the histiocytic diseases are subdivided into three groups: HISTIOCYTOSIS, LANGERHANS CELL; HISTIOCYTOSIS, NON-LANGERHANS-CELL; and HISTIOCYTIC DISORDERS, MALIGNANT. 190957008 M0023956