A surgical procedure to decrease mass effect by removing a portion of a tumor or dead tissue. See mass effect.


Dexamethasone. A glucocorticosteroid medication used to reduce brain tissue swelling.


Refers to a surgical procedure during which bone, tissue, or tumor is removed to lessen intracranial pressure.


A mature cell returning to a less mature state. See differentiate, undifferentiated.


See drug delivery.


The amount of darkness or light in an area of a scan reflects the compactness and density of tissue.


Dual-energy X-ray absorptiometry. A technique used to measure bone mineral density, but which can also be used to measure body composition.

Diabetes (Diabetes Insipidus)

A problem with water balance in the body causing excess urine production and great thirst, due to pituitaryhypothalamic damage. Diabetes mellitus, which has the same symptoms, is due to insufficient insulin production by the pancreas.

Diabetes (Diabetes Mellitus)

A metabolic disease in which carbohydrate utilization is reduced and that of lipid and protein enhanced; it is caused by an absolute or relative deficiency of insulin and is characterized, in more severe cases, by chronic hyperglycemia, glycosuria, water and electrolyte loss, ketoacidosis, and coma; long-term complications include development of disorders of the nervous system, eyes and kidneys; generalized degenerative changes in large and small blood vessels, and increased susceptibility to infection.


An expert in the practical application of diet in the prevention of disease or of a process that can lead to disease, and in the treatment of disease.


The process cells undergo as they mature into normal cells.



Lacking a distinct border, not localized, spread out. Opposite of circumscribed.


Double vision.

Dopamine Agonists

Medications with predominant effects on pituitary cells that harbor receptors for the chemical transmitter dopamine.

Doppler Ultrasonography

An application of diagnostic ultrasound used to detect moving blood cells or other moving structures and measure their direction and speed of movement. The Doppler effect is used to evaluate movement by measuring changes in frequency of the echoes reflected from moving structures.

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