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    The lipid substance forming a sheath around the axons of certain nerve fibers.


A fatty substance in the blood.

Tissue that conveys sensation, temperature, position information to the brain.


Myelodysplastic Syndrome
A group of neoplasms that originate in a primitive multipotential hematopoietic cell.. About half of the cases are mild to moderate anemias accompanied by mild to moderately reduced white cell and platelet counts. Often, these are not progressive but they have a heightened propensity to evolve into acute myelogenous leukemia. The other half of the cases are a type of low blast count leukemia that may be associated with severe white cell and platelet deficits. Many of the patients affected require transfusion therapy, have a propensity to infection or to bleeding, and frequently progress to more overt leukemia.

A specific X-ray study that uses an injection of a dye or contrast material into the spinal canal to allow careful evaluation of the spinal canal and nerve roots.

Myeloid leukemia
One form of cancer of the blood-forming tissue, primarily the bone marrow and lymph nodes.

A tumour of plasma cells, generally secreting a single species of immunoglobulin.


Inflammation of the brain and its meninges.

A tumor that has transfered from one organ (or part) to another not directly connected to it.

A small liver.

Morphologic diagnosis
The interpretation of the abnormalities in terms of severity, time, lesion and anatomic site. For example: severe, chronic, glomerulonephritis.

Adj. Relating to or resembling mucus.


Mucinous edema (swelling).

The visual perception that objects are larger than they actually are.

Magical thinking
A conviction that thinking equates with doing. Occurs in dreams in children, in primitive peoples, and in patients under a variety of conditions. Characterized by lack of realistic relationship between cause and effect.

Manifest content
The remembered content of a dream or fantasy, as contrasted with latent content, which is concealed and distorted.

Memory consolidation
The physical and psychological changes that take place as the brain organizes and restructures information that may become a permanent part of memory.

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