- For Women Facing a Breast Biopsy
- Benign breast conditions: Not all lumps are cancer
- Diagnostic tests for breast conditions
- Types of biopsy procedures
- Questions to ask before having a biopsy
- Your breast biopsy results
- Biopsy and surgery: How they work together
- Waiting for the results
- You are not alone: Getting emotional support
- To learn more
- Appendix A: What is breast cancer?
- Appendix B: Guidelines for early detection of breast cancer
- Appendix C: Mammograms: Finding hidden breast cancer
- Appendix D: American Cancer Society support services for people facing cancer
Appendix C: Mammograms: Finding hidden breast cancer
One of the best things a woman age 40 or older can do to defend herself against breast cancer is have yearly screening mammograms.
What is a mammogram?
A mammogram is a special x-ray that makes a picture of the inside of the breast. Mammograms use radiation, but the amount is very low. The potential harm from this small amount of radiation is very small and far outweighed by the potential benefit.
Mammograms can be done in a radiology facility, a hospital or clinic, or a doctor’s office. There are 2 kinds of mammograms:
A screening mammogram is an x-ray of the breast of a woman who has no breast symptoms or problems. Women age 40 and older should get screening mammograms every year to look for changes in their breast tissue. Because most breast cancers do not cause symptoms, a screening mammogram may be the best way for most women to find cancers early, when they are small, have not spread, and are most treatable.
A diagnostic mammogram is used to find breast disease in women who have symptoms or areas of change on their screening mammogram. Diagnostic mammograms help the doctor learn more about breast masses or the cause of other breast symptoms.
Screening mammograms are usually not very useful for women younger than 40. This is because breast tissue in most younger women is too dense to give a good, clear x-ray image. Still, women who have a family history of breast cancer, a genetic tendency, or certain other factors may need to start testing before age 40. They may also need to be screened with an MRI along with a mammogram. Talk with your doctor about your history and the screening tests and schedule that are best for you.
When doctors look at mammograms, they compare the x-rays from previous mammograms and look for differences between the breast images. Sometimes the x-ray will show tiny bits of calcium in the breast called microcalcifications. Most microcalcifications are harmless, but in some cases, they can be a sign of cancer or a pre-cancerous change. The doctor looks at the shape and arrangement of the microcalcifications to decide if a biopsy is needed.
Sometimes, the doctor sees an area of the breast that looks a little different but not enough to report the mammogram as abnormal. When this happens, the doctor may ask that the mammogram be repeated in about 4 to 6 months.
The mammogram may also show the presence of a mass, or suspicious-looking area of tissue. Masses or lumps are not a sure sign of cancer. The doctor will look at the size, shape, and margins (edges) of the mass to figure out the likelihood of cancer. More testing may be needed to find out if it’s cancer.
Mammograms are the best way for most women to check for breast cancer in its early stages, but a mammogram alone cannot prove that breast change is cancer. If cancer is suspected, more testing will be needed.
- Only 2 to 4 mammograms in 1,000 lead to a diagnosis of cancer.
- Some women will need to have more tests or another mammogram after the first one is taken. Don’t be alarmed if this happens to you. Being called back for more testing does not mean that you have cancer. Sometimes this happens if there is a technical problem with the x-ray film, or if the film was hard to read.
- Very few women who need repeat mammograms will need a biopsy, and about 80% of those biopsies will not be cancer.
- Breast cancer can be cured, especially if it’s caught early.
Last Medical Review: 07/21/2014
Last Revised: 07/21/2014