Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «M»:
Myelinization: The formation of the myelin sheath around a nerve fiber. Also known as myelination....
Myelitis: Inflammation of the spinal cord. ...
Myelitis, transverse: A disease of the spinal cord in which there is demyelination (erosion of the myelin sheath that normally protects nerve fibers). The onset of the disorder is typically sudden. Symptoms include back pain followed by ascending weakness in the legs. There is no cure. Many patien...
Myelodysplastic syndrome: A group of bone marrow disorders characterized by the underproduction of one or more types of blood cells due to dysfuntion of the marrow. The myelodysplastic syndromes (MDS) may arise de novo (newly) or be secondary to treatment with chemotherapy or radiation therapy for a...
Myeloencephalitis:Inflammation of both the spinal cord and the brain.
Myeloencephalitis (also called encephalomyelitis) can be caused by a variety of conditions that lead to inflammation of the spinal cord and brain. Among the common causes of myeloencephalitis are viruses which infect the nervou...
Myelofibrosis: Fibrosis (spontaneous scarring) of the bone
marrow. This can be associated with a variety of diseases, primarily myeloproliferative (pre-leukemic) disorders. Sometimes used interchangeably with agnogenic myeloid metaplasia. Myelofibrosis is characterized by significant anemia and an e...
Myelogenous: Referring to the nonlymphocytic groups of white blood cells, including the granulocytes, monocytes and platelets.
Synonymous with myeloid. Acute myelogenous leukemia is therefore also known as acute myeloid leukemia....
Myelogenous leukemia, acute
Myelogenous leukemia, acute: Abbreviated AML. Also called acute myeloid leukemia or acute nonlymphocytic leukemia (ANLL). A quickly progressive malignant disease in which there are too many immature blood-forming cells in the blood and bone marrow, the cells being specifically those destined to give...
Myelogram: An x-ray of the spinal cord and the bones
of the spine. During a myelogram, a contrast material that is injected into
the spinal canal is used to visualize the structures of the
spinal cord and nerve roots....
Myeloid: Referring to the nonlymphocytic groups of white blood cells, including the granulocytes, monocytes and platelets.
Synonymous with myelogenous. Acute myeloid leukemia is thus also known as acute myelogenous leukemia....
Myeloid leukemia, acute
Myeloid leukemia, acute: A quickly progressive malignant disease in which there are too many immature blood-forming cells in the blood and bone marrow, the cells being specifically those destined to give rise to the granulocytes or monocytes, both types of white blood cells that fight infections. In...
Myeloma: A tumor of antibody-producing cells, called
plasma cells, that are normally found in the bone marrow....
Myeloperoxidase: An enzyme in leukocytes (white blood cells) that is linked to inflammation and cardiovascular disease. An elevated blood level of the enzyme predicts the early risk of myocardial infarction (heart attack). Abbreviated MPO....
Myeloperoxidase deficiency: Deficiency of the enzyme myeloperoxidase which may predispose to severe fungal infections. The enzyme is critical to the oxygen-dependent killing of bacteria by leukocytes (white blood cells)....
Myeloproliferative: Referring to the proliferation of the bone marrow cells that give rise to red blood cells, granulocytes (a type of white blood cells), and/or platelets (crucial to blood clotting). The term myeloproliferative is in contrast to lymphoproliferative which refers to proliferation of ...