Cancer is most easily treated and cured when it is discovered in an early stage. Mammograms do not prevent breast cancer or reduce a woman's risk of developing cancer. But for women ages 40 to 74, mammograms can help reduce deaths from breast cancer. 1
Your doctor may recommend testing at a younger age if you have risk factors for breast cancer.
A mammogram that appears to detect a cancer, when in fact a cancer is not present ( false-positive results ), can occur at any age but is more likely to occur in younger women. About 5% to 10% of screening mammograms will require more testing. This may include another mammogram of specific breast tissue or another test, such as an ultrasound . Most of these tests will show no cancer is present.
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Why It Is Done
A mammogram is done to:
How To Prepare
If you have previously had a mammogram done at another clinic, have the results sent or bring them with you to your examination.
Tell your doctor if you:
On the day of the mammogram, do not use any deodorant, perfume, powders, or ointments on your breasts. The residue left on your skin by these substances may interfere with the X-rays.
If you are still having menstrual periods, you may want to have your mammogram done within 2 weeks after your menstrual period ends. The procedure will be more comfortable, especially if your breasts become tender before your period starts.
How It Is Done
A mammogram is done by a radiology technologist or mammogram technologist. The X-ray pictures (mammograms) are interpreted by a doctor who specializes in evaluating X-rays (radiologist).
You will need to remove any jewelry that might interfere with the X-ray picture. You will need to take off your clothes above the waist, and you will be given a cloth or paper gown to use during the test. If you are concerned about an area of your breast, show the technologist so that the area can be noted.
You usually stand during a mammogram. One at a time, your breasts will be placed on a flat plate that contains the X-ray film. Another plate is then pressed firmly against your breast to help flatten out the breast tissue. Very firm compression is needed to obtain high-quality pictures. You may be asked to lift your arm. For a few seconds while the X-ray picture is being taken, you will need to hold your breath. Usually at least two pictures are taken of each breast: one from the top and one from the side.
You may be in the mammogram clinic for up to an hour. The mammogram itself takes about 10 to 15 minutes. You will be asked to wait (usually about 5 minutes) until the X-rays are developed, in case repeat pictures need to be taken. In some clinics and hospitals, X-ray pictures can be viewed immediately on a computer screen (digitally).
How It Feels
A mammogram is often uncomfortable but rarely extremely painful. If you have sensitive or fragile skin, or a skin condition, let the technician know before you have your exam. If you have menstrual periods, the procedure is more comfortable when done within 2 weeks after your period has ended.
The X-ray plate will feel cold when you place your breast on it. Having your breasts flattened and squeezed is usually uncomfortable. But it is necessary to flatten out the breast tissue to obtain the best pictures.
A mammogram may help find cancer early. But finding cancer early doesn't always save lives. In some cases the cancer will have already spread to other parts of the body.
A mammogram may appear to detect a cancer even when a cancer is not present (false-positive results). This can occur at any age but is more likely with younger women. False-positive results can lead to emotional distress and unneeded tests and treatments.
A mammogram may miss finding breast cancer even when it is there (false-negative results). This is more likely to happen with young women who have dense breasts. False-negative results can keep a woman from getting treatment and can give her a false sense of security.
Also, mammograms may find certain types of breast cancer that would never cause symptoms or threaten a woman's life. But doctors cannot tell what kinds of cancer will cause problems, so all cancers are treated. This means that women may end up having tests and treatments they don't need. These can cause harm.
There is always a slight risk of damage to cells or tissue from being exposed to any radiation, including the very low levels of radiation used for this test. But the risk of damage from the X-rays is very low compared with the potential benefits of the test.
A mammogram is an X-ray of the breast that is used to screen for breast cancer . Mammogram results are usually available within 10 days. It is not uncommon to be asked to return for another test so an additional view of an area in question can be obtained.
In the United States, facilities that perform mammograms send the results directly to your doctor's office and must send you a copy of the test results (written in language that is easily understood) within 30 days.
Most abnormalities found during a mammogram are not breast cancer . But many women who have regular screening mammograms need more tests to investigate any abnormalities found during a mammogram. If an area of your breast tissue appears to be a concern during a mammogram, other tests may be done.
What Affects the Test
Reasons you may not be able to have the test or why the results may not be helpful include:
A mammogram is not usually done if you are:
What To Think About
Other Places To Get Help
Last Revised: November 1, 2012
National Cancer Institute (2010). Breast Cancer Screening (PDQ)?Health Professional. Available online at: http://www.cancer.gov/cancertopics/pdq/screening/breast/HealthProfessional.
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