Neoplastic Process
histiocytosis Audio
[ his-tee-oh-sy-toh-sis ]
Subclass of:
Lymphatic Diseases
Definitions related to histiocytosis:
  • A morphologic finding indicating tissue infiltration by non-neoplastic or neoplastic histiocytes.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • An excessive number of histiocytes (tissue macrophages).
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2021
  • 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.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
  • The histiocytoses encompass a group of diverse disorders characterized by the accumulation and infiltration of variable numbers of monocytes, macrophages, and dendritic cells in the affected tissues. Such a description excludes diseases in which infiltration of these cells occurs in response to a primary pathology.
    Medscape
    WebMD, 2019
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.