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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «H»:

  1. Histiocytosis, malignant Histiocytosis, malignant
    Histiocytosis, malignant: Histiocytosis in which the histiocytes actually become cancerous. Treatment is by radiation and chemotherapy, and in some cases bone-marrow transplantation. See also histiocytosis....
  2. Histiocytosis, sinus Histiocytosis, sinus
    Histiocytosis, sinus: A variant of histiocytosis in which the lymph nodes are the main site of histiocyte proliferation. The sinuses become filled with and distended by masses of histiocytes. See also histiocytosis....
  3. Histo Histo
    Histo: Popular name for the fungus histoplasma. Also medical school slang for histology....
  4. Histo spot Histo spot
    Histo spot: A small circular punched-out spot in the retina at a site where spores of the fungus histoplasma (histo) seeded in the eye. Histo spots may be multiple, found in both eyes, and scattered throughout the retina. Histo spots in the macula are significant since they may stimulate the growth...
  5. Histocompatibility Histocompatibility
    Histocompatibility: Literally, tissue compatibility. With full histocompatibility between a donor and recipient, tissue can be transplanted without being seen as foreign and being attacked by the immune system of the recipient....
  6. Histocompatible Histocompatible
    Histocompatible: Literally, tissue compatible. If a donor and recipient are histocompatible, a transplant is expected to be easily accepted. ...
  7. Histology Histology
    Histology: The study of the form of structures seen under the microscope. Also called microscopic anatomy, as opposed to gross anatomy which involves structures that can be observed with the naked eye. Traditionally, both gross anatomy and histology (microscopic anatomy) have been studied in the...
  8. Histone Histone
    Histone: A protein around which DNA coils to form chromatin. Without this protein material, DNA could not organize into chromosomes, and life as we know it would not exist....
  9. Histoplasma Histoplasma
    Histoplasma: Full name: histoplasma capsulatum. A microscopic fungus that causes the disease histoplasmosis. The fungus is found throughout the world in river valleys and soil where bird or bat droppings accumulate. The spores of the fungus are released into the air when contaminated soil is distur...
  10. Histoplasma capsulatum Histoplasma capsulatum
    Histoplasma capsulatum: See: Histoplasma....
  11. Histoplasmosis Histoplasmosis
    Histoplasmosis: A disease caused by the fungus Histoplasma capsulatum. Most people with histoplasmosis have no symptoms. However, histoplasma can cause acute or chronic lung disease and progressive disseminated histoplasmosis affecting a number of organs. It can be fatal if untreated. Positive sk...
  12. History, developmental History, developmental
    History, developmental: An account of how and when a person met developmental milestones, such as walking and talking. For adults, information on social-emotional development may be included. Used primarily in the diagnosis of developmental disorders....
  13. History, family History, family
    History, family: The family structure and relationships within the family, including information about diseases in family members. The family history is often recorded in a family pedigree (family tree), which uses conventional symbols. The pedigree provides a ready view of problems or illnesses wit...
  14. History, medical History, medical
    History, medical: See: Medical history....
  15. History, social History, social
    History, social: An account of a patient that puts his illness or behavior in context. It may include aspects of the patient's developmental, family, and medical history, as well as relevant information on life events, social class, race, religion, and occupation. Useful for designing treatment...