Large adenoma.

Magnetic Field Gradient

A variation in the magnetic field with respect to position.

Magnetic Resonance Imaging (MRI)

MRI is a scanning device that uses a magnetic field, radio waves, and a computer.


In reference to an abnormal tissue growth neoplasm (cancer), having the property of locally invasive and destructive growth and metastasis (spreading).


Imaging examination of the breast by means of x-rays

Mass Effect

Damage to the brain due to the bulk of a tumor, the blockage of fluid, or excess accumulation of fluid within the skull.


The word medial comes from the Latin medialis, from medius, meaning the middle. Medial is the adjective corresponding to the noun median, as in the median in a highway.

Median Survival

Median means the middle value.

Medroxyprogesterone Actetate

A semi-synthetic medication which is close in structure and function to the naturally occurring female sex hormone, progesterone.


Thin layer of tissue covering a surface, lining a body cavity, or dividing a space or organ.

Meninges, Plural of Meninx

Any membrane; specifically, one of the membranous coverings of the brain and spinal cord.


The spread of a disease process from one part of the body to another.


Small adenoma.


Using an operating microscope to better visualize a small operating field or perform delicate surgery.


One-thousandth of a roentgen.

Available Now!

PPRG6-500 Cover
The Pituitary Patient Resource Guide Sixth Edition is now available! Be one of the first to have the most up-to-date information. The Pituitary Patient Resource Guide a one of a kind publication intended as an invaluable source of information not only for patients but also their families, physicians, and all health care providers. It contains information on symptoms, proper testing, how to get a diagnosis, and the treatment options that are available. It also includes Pituitary Network Association's patient resource listings for expert medical care.

Buy Now

  • CalendarPNAJune


Continuing Education Program

Knowledge Icon 500

If you are a nurse or medical professional, register for PNA CEU Membership and  earn CEU credits to learn about the symptoms, diagnosis and treatment options for patients with pituitary disorders. Help PNA reduce the time it takes for patients to get an accurate diagnosis.

button registerNow

For more information click here!