Thursday, November 8, 2007

Breast Cancer: MRI

Breast MRI (magnetic resonance imaging) is a test that may be used to distinguish between benign (noncancerous) and malignant (cancerous) lesions. Performing this test may reduce the number of breast biopsies done to evaluate a suspicious breast mass. Although MRI can detect tumors in dense breast tissue, it cannot detect tiny specks of calcium (known as microcalcifications), which account for half of the cancers detected by mammography.

Is the Breast MRI Test Safe?
Yes. MRI examination poses no risk to the average patient if appropriate safety guidelines are followed.

People who have had heart surgery and people with the following medical devices can be safely examined with MRI:

Surgical clips or sutures.
Artificial joints.
Staples.
Most heart valve replacements.
Disconnected medication pumps.
Vena cava filters.
Brain shunt tubes for hydrocephalus.
Some conditions may make an MRI examination inadvisable. Tell your doctor if you have any of the following conditions:

Heart pacemaker
Cerebral aneurysm clip (metal clip on a blood vessel in the brain)
Implanted insulin pump (for treatment of diabetes), narcotics pump (for pain medication), or implanted nerve stimulators ("TENS") for back pain
Metal in the eye or eye socket
Cochlear (ear) implant for hearing impairment
Implanted spine stabilization rods
Severe lung disease
Uncontrolled gastroesophageal reflux (a condition causing severe heartburn)
In addition, tell your doctor if you:

Are pregnant.
Weigh more than 300 pounds.
Are not able to lie on your back for 30 to 60 minutes.
Have claustrophobia (fear of closed or narrow spaces).
How Long Is the Breast MRI Test?
Allow 1 1/2 hours for your MRI exam. In most cases, the procedure takes 45 to 60 minutes, during which time several dozen images may be obtained.

What Happens Before the Exam?
Personal items such as your watch, wallet -- including any credit cards with magnetic strips (they will be erased by the magnet) -- and jewelry should be left at home if possible, or removed prior to the MRI scan. Hearing aids should be removed before the test since they can be damaged by the magnetic field. Secured lockers are typically available to store personal possessions.

What Happens During the Exam?
You will be asked to wear a hospital gown during your breast MRI.

As the MRI scan begins, you will hear the equipment making a muffled thumping sound that will last for several minutes. Other than the sound, you should experience no unusual sensations during the scanning.

Certain MRI exams require that you receive an injection of a contrast material. This helps identify certain anatomic structures on the scan images.

Feel free to ask questions or tell the technologist or the physician if you have any concerns.

What Happens After the Exam?
Generally, you can resume your usual activities and normal diet immediately.

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