What does it mean to have dense breast tissue, and how does it affect you throughout life, especially when it comes to breast cancer risks and treatments? Dense breast tissue is common—about 40% of women have it in certain areas or throughout their breasts. Dense tissue can make it more challenging to detect breast cancer, especially in its early stages, because dense tissue and tumors both appear white on mammograms, making abnormalities harder to spot. So, what does it mean for you if you have dense breast tissue? Here’s what you should know.
Let’s Talk About Breast Tissue
Before we dive right into what dense breasts are, let’s first talk about what breast tissue typically consist of.
Your breast has three kinds of tissue — fibrous, glandular, and fatty. The fibrous tissue holds your breast tissue in place, glandular tissue helps make milk if you have children and carry it to your nipple. Fatty tissue fills in the space between your fibrous tissue, lobes, and ducts. Fatty tissue is what gives your breasts their size and shape.
Your breast density shows how much fibrous and glandular tissue you have compared with the amount of fatty tissue in your breasts. You’ll be able to see if you have denser breasts with a mammogram, as dense breast tissue shows as more white and grainy vs. fatty tissue.
As of September 10, 2024, the U.S. Food and Drug Administration (FDA) requires all mammography facilities to inform patients whether or not they have dense breasts. They also require that the facilities recommend these women to discuss their risks with their health care provider.
What are the four categories of breast density?
Many women have dense breast tissue, but not all women have the same category of dense breasts. You’ll typically fall in one of the four categories:
- Almost entirely fatty — in other words, your breasts are almost entirely made up of fatty tissue. There is very little (if any) dense breast tissue in this category.
- Scattered areas of density — this is when your breasts are mostly made up of fatty tissue, but you have some scattered areas of dense breast tissue.
- Heterogeneously dense — most of your breast tissue is dense breast tissue, but you have some areas of fatty tissue.
- Extremely dense — almost all of your breast tissue is dense breast tissue and there is very little fatty tissue.
Who’s more likely to have dense breasts?
There are a few factors that play a part in if you’ll have dense breasts. These include:
- Age (women under 50 tend to have denser breasts)
- If you’re pregnant or breastfeeding
- If you’re taking hormone replacement therapy
- Your body weight — the lower it is, the more likely you have dense breasts
- Genetics — dense breast tissue can be passed from generation to generation
Remember, you will not know you have dense breast tissue just by looking at or feeling your breasts. You’ll need to get a mammogram, even if you know it runs in your family.
Why is it important to know if I have dense breasts?
Good question! Knowing if you have dense breasts can benefit you in a few different ways. Having dense breast tissue can make it harder for doctors to detect smaller tumors in mammograms. Both tumors and dense breast tissue look white in mammogram images. So a doctor won’t be able to easily distinguish small tumors, which can make a huge difference in being diagnosed earlier vs. later.
Women who have dense breasts have a slightly higher risk of developing breast cancer. And, the denser your tissue, the higher the risk. With the two, this could mean having breast cancer and being diagnosed later, which can effect treatment options. Luckily, even though women with dense breasts are at higher risk of developing breast cancer, they aren’t at higher risk of dying from breast cancer.
Should I worry if I have dense breast tissue?
No! Luckily, the advancements in breast cancer treatments and technology make it much easier to both a) screen for breast cancer and b) treat breast cancer faster, thus increasing survival rates. Of course, technology and care can always improve, but we are in a much better state in 2024 than we were just 30 years ago.
Even though you shouldn’t worry, it is important to be aware of your dense breasts and have your yearly mammogram beginning at the age of 40 if you are at average risk. A doctor will also let you know if you’re at a greater-than-average risk for developing breast cancer (ie. family with breast cancer, smoker or drinker, etc). You can discuss with them on whether you should have supplemental screening in addition to your yearly mammogram and even if you should begin breast cancer screening before age 40. If you’re high risk, you should join a high-risk screening program starting at age 25 or as soon as you learn that you are at high risk.
Again, don’t panic or worry. Remember, dense breast tissue is more common than you think. You just have to take an extra step or two in some cases to mitigate your risk and take care of your health.
Other FAQs
Of course, you may still have questions, and that’s okay! Let’s talk about some other common questions many women have.
Are there any tests that are better for dense breasts?
Yes and no. Mammograms are still the safest and best recommendation for detecting breast cancer, and they really do save lives — even amongst women who have dense breasts.
However, depending on your breast density and your specific breast cancer risks, there are a few other options that your doctor may recommend.
Let’s talk about the concerns that surround many of these tests. Some (like an MRI) may pick up on “abnormalities” during testing that are later found to not be cancer. These results are called false-positives. While this doesn’t always happen, it’s happened often enough that many people are made aware before testing. On top of that, unlike mammograms, no other test has been proven to reduce the risk of dying of breast cancer.
With that being said, your healthcare provider may offer additional testing that may include:
3D mammograms
These mammograms, (also known as breast tomosynthesis) use X-rays to take pictures of your breasts from different angles. Then these images are put together in order to show a 3D image of the breast tissue. New studies have suggested that a 3D mammograph can be helpful for women with dense breasts. It can be used as a screening test with or instead of standard mammography. The main drawback is that not every imaging center has one. Others have noted that 3D mammograms can find between 2.2 and 2.5 more cancers in dense breasts than traditional mammograms.
Breast MRI
Breast MRIs use a magnetic field and radio waves to make 3D images of your breast tissue. These tests are usually recommended to those with a very high risk of breast cancer. While studies are conclusive, these MRIs may find up to15.5 more cancers per 1,000 screenings in women. However, these tests are incredibly expensive and not as easily available. They also tend to have high false-positive rates.
Breast ultrasound
Ultrasound uses sound waves to make images of whatever it pictures in your body. These tests show the difference between solid masses and sacs filled with fluid (cysts). When it shows solid masses, that could a sign of cancer. Usually, if there is a cause of concern during your mammogram, you’ll be recommended next to a diagnostic breast ultrasound. There are two options; whole body and hand-held. Hand-held ultrasounds use a small, portable device to send high-frequency sound waves through the breast. Whole body ultrasounds use a larger machine to send high frequency sound waves through the breast, and you’ll typically be on your back (like an MRI).
Molecular breast imaging
This test uses a radioactive tracer and a special camera to make pictures of your breast tissue. The tracer itself can help find areas that may have cancer.
Contrast-enhanced digital mammogram
The least common out of additional tests, this test uses a contrast-enhanced digital mammogram and material that contains iodine to highlight possible areas of concern on your mammogram. The contrast material will go into a vein in your arm, and you’ll need to wait a few minutes for the contrast to reach the breast tissue before you undergo your mammogram.
Of course, each of these tests have pros and cons. It’s essential to talk to your doctor about what may work best for you if additional testing is ever needed.
What are false-positives?
As we mentioned above, some of the additional testing options tend to have a higher rate of false positive results. So let’s break down what that means for you.
Some tests have higher recall rates. This means that you’re called back for more tests if an area during your testing looked suspicious. If the next test turns out “normal”, your previous one is considered a “false-positive”.
Now, if these tests come back as “abnormal”, your doctor may perform a biopsy to confirm cancer. If that biopsy shows the area is normal, it’s called false-positive biopsy.
If a test ever comes back as abnormal, please don’t panic. Again, these tests have slightly higher rates of false-positives. And if you do have breast cancer, healthcare professionals can confirm and will be able to recommend treatment options.
Are there any clinical trials for women with dense breasts?
Yes, there are currently some ongoing and completed clinical trials for dense breasts. These trials are mainly studying better ways to detect breast cancer in women with dense breasts.
Dense Breast Tissue Wrap Up
Many women have dense breast tissue, and that’s okay! It doesn’t mean anything is wrong with your breasts or you. It simply means you may need additional screenings or earlier testing if you have other high-risk factors for developing breast cancer. But overall, having dense breasts shouldn’t cause you any worry, they’re healthy and normal.
As always, just be sure to perform regular monthly self-exams, get your mammogram when recommended, and don’t be afraid to speak up if you believe something is wrong. Your doctors are there to listen and help.
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This was very easily explained and answered many questions I had. Thank you for talking in terms of the patient.