What dense breasts on your mammogram report really mean for your cancer risk

So picture this the radiologist is trying to find a polar bear in a snowstorm. That's what it's like looking for a small cancer in dense tissue. It can hide.

Nearly half of all women have dense breasts. Most of us couldn't tell you what that means. And here's the thing, it's printed on your mammogram report. So let me ask you, do you know what yours says?

Hi everyone, it's Natalie. I'm so glad you're here today. You know, I know what mine says for 10 years. Every mammogram I have had has been followed by an ultrasound because I have dense breasts and I know that unsettled feeling in between, sitting in the gown, waiting, telling yourself it's just routine, and then still feeling your heart rate go up a little bit every single time. I ask myself the same question. Why can't I just skip the mammogram and go straight to the ultrasound?

Well, I finally got the answer, and I'm gonna share it with you today. It's October breast cancer awareness month. You're gonna see a lot of pink this month. You probably already have a lot of ribbons, a lot of get your mammogram reminders. And those matter. Maybe breast cancer has impacted you personally, or maybe it's impacted someone you love. Pretty much all of us know someone who's had a scare or breast cancer diagnosis. But today I wanna talk about one.

very specific and practical thing that paragraph on your report. I've covered health news for nearly 30 years and I'd say this is one of the least explained changes in women's health in a really long time. A national rule actually changed what every woman in this country gets told after a mammogram. And not many of us know. We haven't had that

That hasn't been explained to us, and we don't know what to do with that information. So here's my promise: by the end of this episode, you're gonna know whether you have dense breasts, what that actually means, and why the tests happen in the order they do, what's changed with insurance, and then three questions to take to your next appointment. I have put those three questions in a really simple card that you can save on your phone. It's in this week's newsletter at NatalieTisdal.com.

Forward slash newsletter. All right, let's get started today. It's just me and I've got a whole lot of information to get to today. The basics first, because this one confuses a lot of people. Breast density, it has nothing to do with size. It has nothing to do with how your breasts look or feel. You can't tell whether you have dense breasts by looking in the mirror or even by doing a self-exam. Density only shows up on a mammogram. Our breasts are made of

Two main kinds of tissue, fatty tissue and what's called fibroglandular tissue. That is the glands and the connective tissue. And the more fibroglandular tissue you have compared to fat, well, the denser your breasts are. And here is what surprised me and will probably surprise you too.

According to the U.S. Preventive Services Task Force, nearly half of all women have dense breasts. Half, 50%. So if this is you, you're in good company. Now, why does it even matter? Well, two reasons. The first is what doctors call masking. Maybe you've heard of this. On a mammogram, fatty tissue, it looks dark. Pretend like you're looking at a mammogram if you've ever seen one. Dense tissue, on the other hand, looks white. And a tumor

also looks white. So picture this the radiologist is trying to find a polar bear in a snowstorm. That's what it's like looking for a small cancer in dense tissue. It can hide. The second reason is that dense tissue is also a risk factor on its own.

So it doesn't just make cancer harder to see. Women with dense breasts also have a somewhat higher chance of developing breast cancer. Don't let it scare you. But here's exactly how your report puts it if you have dense breasts. Every facility in the country has to use these exact words. Here we go. Breast tissue can be either dense or not dense. Dense tissue makes it harder to find breast cancer on a mammogram. And also

raises the risk of developing breast cancer. Your breast tissue is dense. In some people with dense tissue, other imaging tests in addition to a mammogram may help find cancers. Talk to your healthcare provider about breast density, risks for breast cancer, and your individual situation.

Okay, so you need to talk to your doctor. But here's something else most of us never see. The letter you get usually just says dense or not dense, but the report that goes to your doctor puts you in one of four categories A, almost entirely fatty, B scattered areas of density, C is called heterogeneously dense, and D

Extremely dense. A and B count as not dense. That's the 50%. C and D count as dense. So here's your first homework assignment today. Pause if you need to, because after this episode, or if you want to pause right now and go do it, log in to your patient portal. Hopefully you know where that is. If not, find it. Pull up your last mammogram report. Look for the word density. If you can find your letter, there on that portal.

And then one more thing. Dense breasts, I want to tell you and remind you, they're common. They're normal. They're not a diagnosis or something even that you have to worry about. Density often decreases as we get older and as we go through menopause. Not always, but it didn't happen for me. It does for many people. Mine clearly hasn't gotten that memo, but it's okay. And I'm okay so far. So how did that paragraph I read a moment ago end up?

On every report in the country. Well, this is a story I love because it started with patients and someone who wanted to make a difference. For years, a lot of women were told that their mammograms were just normal. And then later they found out that they had cancer that the mammogram couldn't see. Some of them had never been told that they had dense breast tissue at all. One of the women who changed that was Nancy Cappello. She was an educator in Connecticut. Nancy did everything right.

She got her mammograms every year, just like she was supposed to for about a decade. They all came back normal. And then months after one of those normal mammograms, her doctor fell to lump during a routine exam. So here's what happened next. Another mammogram still showed nothing, but an ultrasound found the tumor. It was stage 3C breast cancer. It had already spread to 13 lymph nodes. And here's the part that stopped me.

Nancy had extremely dense breast tissue.

Her mammograms had been noting that for years, but no one even told her. She had no idea.

In 2008, she founded a group called Are You Dense? And in 2009, Connecticut became the first state in the country to require that women be told about their breast density, state after state, then followed suit. Nancy died in 2018 from complications related to her cancer treatment. That was six years before the national rule finally took effect.

So every time you see that paragraph on your report, whether you have dense tissue or not, you can thank Nancy. And then the women who kept pushing after Nancy, who believed in her cause. It worked, but let me just say this: it was patchwork because by the time the federal government stepped in, 39 states plus Washington, DC, had their own density laws. And they all said it a little bit differently.

Well, then the FDA updated the national standards for mammography. Since September 10th, 2024, fairly recently, every mammography facility in the United States has to tell every patient whether her breast tissue is dense or not dense in the exact same words so that it's not confusing. And that's the paragraph that I just read to you a couple of minutes ago. That same year, 2024, the U.S. Preventative Services Task Force.

Lowered the age to start routine mammograms. It now recommends a mammogram every two years for women 40 to 74. So far, this sounds like good news, right? And for the most part, it is. But I'm a journalist and I'm gonna give you the other side too, because some very respected doctors have some real concerns about this rule. And I think it's important, just like always on this podcast, that we understand.

Both sides of the story

In an article in The Cancer Letter, Dr. Otis Brawley from Johns Hopkins said, How dense the breast is is in the eye of the mammographer. In other words, two radiologists can look at the same image and call it differently. Dr. Stephen Woolishon at the Dartmouth Institute put it this way: this is an example of where the guidance is way ahead of the data.

And the National Breast Cancer Coalition pointed out that women are being told they have higher risk without clear evidence on what extra screening really does for them. So who's right? What should we feel about this? Honestly, both sides have a point. First of all, you deserve to know what's on your report. That's not up for debate, at least for me. And the science on exactly what to do next, well, it's still catching up, which is why the most important thing you can do right now.

Is what do you think I'm gonna say? Because I talk about this all the time. The most important thing you can do right now is ask good questions. So let me give you some of those and let's be practical. First, the big picture. Density is one piece, just one piece of your risk. It's not the whole story, but it's really important. Your doctor should be looking at density together with your family history and any genetic results, any past biopsies.

And your age. Some practices will calculate based on all of that what's called a lifetime risk score. So ask whether you have one, then ask what is my lifetime risk score? That number shapes what extra screening, if any, makes sense for you. Next, let's walk through all of the tools. And I'm going to keep this pretty simple, but again, it's good to know these things so that you can ask the questions. First of all, there's the 3D mammogram, also called

Tomosynthesis. It takes pictures in thin slices so it can see through some of that density. It helps a lot of women, though it helps less for really dense breasts. There's also breast ultrasound, not radiation, just sound waves. And that's the one that I've now had for about 10 years. It can find small masses that dense tissue hides on a mammogram. The trade-off is more false alarms, which can mean more callbacks. There's also

Breast MRI. It's the most sensitive tool that's available. It uses a contrast dye through an IV, takes a little bit longer, it costs more, and it also has more false positives. There's also a newer option. It's called contrast enhanced mammography. It's a mammogram with the contrast dye. It isn't available everywhere just yet. Okay, so here's where I want to be really honest with you. More screening isn't automatically better.

More screening finds more cancers. It also finds more things that turn out to be nothing. And some of those mean more waiting, more tests, and more worry. The task force says that there really isn't enough evidence yet to recommend extra ultrasound or even MRI for every woman with dense breasts and a normal mammogram. So radiology groups recommend more screening for some women. The answer really depends on again your

Personal risk. We're not all the same. So the goal isn't to get every single test. It's to get the right test for you. Okay, now back to my question from the top of the show. Why can't I just skip the mammogram, go straight to the ultrasound when I know I have dense breasts? First of all, nobody likes getting a mammogram. It's not fun. It's not comfortable. But here's what I learned: the two tests see very different things. A mammogram can see.

Calcifications. Those are tiny specks of calcium in the breast. Most of them are harmless, but certain patterns of them are often the earliest signs of what's called DCIS, a very early stage zero cancer. And ultrasound can't see those. Now, according to Dense Breast Info, a group that tracks all of that research, about half of DCIS cases and one in four to five invasive cancers show up only on the mammogram. That's why we do it.

Even in women with dense breasts. So if I skipped the mammogram and went straight to the ultrasound, I'd be skipping the one test that can catch those. The ultrasound, however, does a different job. It finds what my dense tissue hides on those mammograms. It's called the add-on, not the replacement.

And the radiologists often will read those two things together. The mammogram tells them where to look a little bit more closely. And that's why most centers require the mammogram first before going to the ultrasound. When I understood that, it shifted for me. I stopped asking so many questions. I remember being on the phone with Sally Job, where I went to get my first mammogram and then second and third. And I said, Why do I have to do this? Why can't I just skip right to the ultrasound? So

That unsettled feeling between the two tests didn't completely go away, but it all made sense to me. And here's something I wish someone had told me all those years ago. If you have dense breasts and you're getting a routine ultrasound because of that, it's not the same thing as a callback if you have the mammogram and then you get called back because they see something concerning. It doesn't mean they saw something. It's actually part of your overall plan. Another practical tip: ask if you can book.

both tests back to back on the same day if you know that you are probably gonna have to get the ultrasound. That way they're read together and you are not spending days waiting in between because that waiting, as we all know, is what can be so hard. So let's talk about a part nobody wants to talk about, but we have to, and that's money, because knowing you might benefit from an ultrasound or an MRI doesn't help much if you can't afford it. So here's some good news.

Love giving good news. And it's pretty big. Starting this year, 2026, most private health plans have to cover the follow-up imaging needed to complete your breast cancer screening with no copay and no deductible. That comes from an update to federal guidelines for women's preventive care from an agency called HRSA. The guideline now says that if extra imaging like an MRI or an ultrasound or another mammogram, even is needed to complete the screening.

It counts as preventive care. For most plans, that kicked in in January of 2026. It doesn't create a special rule just for dense breasts, but it specifically notes that this extra testing may be more common for women with dense breasts. On top of that, 38 states plus DC have their own laws requiring some coverage of supplemental screening. And in about 28 of those states, the law limits what you pay out of pocket.

Where I live here in Colorado, we have one of those laws, but it really depends on where you live. So that's something that you can check.

Also in Congress, there's a bill. It's called the Find It Early Act that would require this coverage nationwide, including for federal plans. As of right now, it's just a proposal, but let's be watching for that.

So here's the practical move. Pause here if you need to write this down. Call the number on the back of your insurance card and ask this question.

Is supplemental breast imaging covered as preventive care? And will I owe anything? It's a five-minute call. It could save you a lot of stress. Let me emphasize that. I'm gonna link a map in the show notes where you can check what your state requires. So let me bring this all together for you. I know I gave you a lot of words, a lot of organizations, a lot of information. I've been doing this mammogram, then ultrasound routine for 10 years.

And for most of that time, I went in feeling a little bit dark, doing what I was told, just following along without really understanding why. That's why I've decided to dig into it. And I don't want that for you. So I have three questions I want you to take to your next appointment. So grab a pen or better yet, screenshot the card that I'm going to put in my newsletter. Again, you can get that newsletter on my website. Number one, the question I want you to ask first: Are my breasts dense and what

Category am I? Are my breast stents and what category am I? Number two, based on my full risk picture, would I benefit from extra screening? And then number three, is that screening covered by my plan? And what will I owe? That's it. Three questions. Know your category, know your risk, and then know your coverage. And your homework this week, it's really simple. Log onto your patient portal. If you don't know it, find it.

Find your last report and look for that word density.

If this episode helped you, please share it with a friend. This is one to send to your sister, your mom, that friend that you have coffee with or go on a walk with. You can get all of these questions on my website again by finding that card once you sign up for my newsletter, natalytysdal.com. And then to get the newsletter, Natalytysdal.com forward slash newsletter. It goes out once a week.

With the podcast episode and the Women's Wellness Wire. That's a weekly recap of the women's health news that I send out just to recap everything to you and make it easy for you. There's so much noise out there. What I hope to do is boil it down for you each week into a five-minute read that I think is very helpful. And I've had a lot of great feedback on it. So I'd love to deliver that to your inbox each week. A quick reminder: I'm a health journalist, I'm not a licensed medical professional.

This episode is for information only. It is not a substitute for medical advice. So talk with your own doctor about all of these things that I've brought up today. Thanks so much for being here. I love it that you join me each week. I'm so grateful for you. Be healthy and I'll talk to you next week.