Your Mammogram May Soon Flag a Heart Warning: What Breast Arterial Calcification Means

June 22, 2026

My wife is a healthcare attorney who spends her days in the cardiovascular space, reviewing the policies and regulations that shape how heart care gets delivered. Over dinner recently she told me about a new Maryland law, and I have not stopped thinking about it since. Starting October 1, 2026, Maryland becomes the first state in the country to require that mammogram reports tell a woman when her images show breast arterial calcification. The law is called HB 1364. It asks imaging centers to add a short, non-alarming note explaining that this finding is common, that it may point to higher cardiovascular risk, and that she should talk it over with her doctor.

I think this is one of the better ideas to come out of women’s heart health in years. Let me explain what the finding is, why a preventive cardiologist like me pays attention to it, and why it reminds me so much of a test I already order all the time.

What breast arterial calcification actually is

When a radiologist reads a mammogram, the picture is mostly about breast tissue and the search for cancer. Calcium shows up white on the image. Most of the calcium a radiologist hunts for sits inside the breast tissue itself, and certain patterns of it can signal an early cancer. Breast arterial calcification is a different thing entirely. It traces the walls of the small arteries that run through the breast, showing up as thin white lines that look like railroad tracks following the path of a vessel.

I want to be clear about one point right away, because it is the question every woman asks first. Breast arterial calcification has nothing to do with breast cancer risk. It does not mean cancer, it does not raise your odds of cancer, and finding it is not a reason to worry about a tumor. The white tracks are calcium laid down in the muscular middle layer of the artery wall. Pathologists have a name for this pattern, Mönckeberg medial calcification, which simply means the calcium sits in the muscle layer of the vessel rather than in the fatty plaque layer where heart-attack disease lives.

Here is the part that surprises people. That second process, the plaque layer that drives heart attacks, is technically a separate disease from the medial calcium on a mammogram. They are not the same lesion under a microscope. And yet, study after study has found that women who show breast arterial calcification have measurably more heart disease and more heart-related events down the road. The body is sending a signal through one pathway about trouble brewing in another.

Why a cardiologist cares about a line on a breast X-ray

The reason I care comes down to numbers, and the numbers are hard to ignore. When researchers pool the studies together, women with breast arterial calcification carry roughly double the rate of cardiovascular events compared with women who do not have it. One large analysis that combined 45 studies and more than 68,000 women found higher rates of stroke, heart failure, cardiac death, and death from any cause in the women whose mammograms showed these calcified arteries. The risk of an underlying narrowed coronary artery ran several times higher.

The finding also tracks with the risk factors I treat every day. Women with breast arterial calcification are more likely to have high blood pressure, diabetes, and high cholesterol. There is one quirky exception worth mentioning: smoking does not push this particular calcium pattern up, and may even associate with less of it, since cigarettes tend to drive the other kind of arterial calcium, the plaque kind. So a non-smoker showing these tracks is telling me something real about her metabolic and vascular health.

What makes this genuinely useful is that the signal is strongest in exactly the women our standard tools miss. The risk calculators I use in clinic, the ones that estimate a 10-year chance of heart attack or stroke, were largely built and validated in men and tend to under-call risk in women, especially younger women. Breast arterial calcification shows its sharpest predictive value in women in their 40s and 50s, and it flags risk even in women a calculator would label low. In one study of more than 120,000 women, the calcified arteries predicted future heart events on top of a modern risk score, with heavier calcification carrying steadily higher risk. Roughly one in ten women got reclassified into a higher risk band once the mammogram finding was added in, and many of them went on to have events the original score had missed.

And none of this costs anything extra. The image is already taken. The arteries are already in the picture. For decades radiologists simply did not report what they saw in those vessels, because nobody had told them it mattered to the heart. That is the gap the Maryland law closes.

How common is it?

Common enough that most women reading this will encounter it eventually. Across screening mammograms, breast arterial calcification turns up in somewhere between one in six and one in four women. It climbs steeply with age. Under 50, fewer than one in ten women show it. Past 70, most women do. So if you are postmenopausal and your report mentions it, you are in very ordinary company. The point is not that something is wrong. The point is that your body handed you a piece of information, and it would be a shame to waste it.

The reason it feels familiar: the coronary calcium score

The moment my wife described the Maryland law, my mind went straight to a test I order constantly: the coronary artery calcium score, or CAC score. If you have read my work before, you know I am a believer in it. A CAC score is a quick, low-dose CT scan of the heart that counts the calcified plaque sitting in your coronary arteries. A score of zero is one of the most reassuring numbers in all of cardiology. A high score tells me plaque is already there, and that we need to act.

Breast arterial calcification works in a similar spirit, though through a different door. The CAC score measures calcium in the plaque layer of the heart’s own arteries, the exact lesion that causes heart attacks. Breast arterial calcification measures calcium in the muscle layer of the breast’s arteries, a related but distinct process. The two are not interchangeable, and a woman with breast calcium might still have a low CAC score, or the reverse. They look at different vessels and different layers of the wall.

What they share is more important than how they differ. Both are pictures of your arteries that you can actually see. Both turn an abstract statistical risk into something concrete sitting on a screen. And both, when present, deliver the same blunt message: your arteries are aging in a way that deserves attention, and the smart move is to lower the forces that age them further. When a borderline-risk patient is on the fence about starting treatment, a calcium finding, whether in the heart or on a mammogram, is often what tips the decision toward acting now rather than waiting.

In practice, if a woman comes to me with breast arterial calcification and I am unsure how aggressive to be, a coronary calcium score is a natural next step to sharpen the picture. The mammogram finding raises the question. The CAC score helps answer it. The two tests complement each other rather than compete.

What you should actually do about it

This is the part that matters, so let me be direct. A note about breast arterial calcification on your mammogram is not a diagnosis and not an emergency. It is a prompt. It is your arteries telling you that the basic levers of heart protection deserve a hard look. Those levers are the same ones I push on for every patient at risk, and the evidence says pushing harder on them is where the payoff lives.

The first lever is your LDL cholesterol. LDL is the cholesterol particle that drives plaque, and over a lifetime the total amount your arteries are exposed to tracks directly with your risk of dying from heart disease. A calcium signal is a good reason to find out your number, and if it is high, to lower it in earnest rather than hoping diet alone will do it. Statins remain the foundation, and for women who worry about muscle aches or cannot reach goal on a statin alone, we have additional options that lower LDL dramatically.

The second lever is blood pressure. High blood pressure is one of the conditions that travels alongside breast arterial calcification, and it is one of the most powerful accelerators of arterial damage we know of. A finding like this is a reason to make sure your pressure is measured accurately, tracked over time, and treated to a target below 130/80 if you are at elevated risk. Treating it well is some of the highest-value medicine I practice. You can read more in my guide to managing high blood pressure.

Beyond those two, the familiar foundations still carry weight: a Mediterranean-style way of eating, regular movement, good sleep, not smoking, and getting diabetes or prediabetes under control. None of this is exotic. The value of the mammogram finding is that it gives a specific woman a specific reason to take these steps seriously now, at an age when prevention still has decades to work in her favor.

If you have had breast cancer treatment, this conversation matters double, since some cancer therapies stress the heart on their own. I wrote about that connection in my post on protecting your heart while fighting breast cancer.

An honest word on the limits

I want to keep this balanced. We do not yet have a randomized trial proving that acting on breast arterial calcification, by itself, changes outcomes. We have very strong association data, biological plausibility, and a finding that costs nothing to report, but the formal proof that a “BAC-guided” treatment plan saves lives is still being assembled. The grading of how much calcium is present has not been fully standardized either, though artificial-intelligence tools that measure it automatically are improving fast, and the first such tool already has FDA clearance.

So I would not want a woman to read a note about breast arterial calcification and panic, and I would not want her to read it and do nothing. The right response sits in between. Treat it as a nudge to sit down with your physician, know your cholesterol and blood pressure numbers, and decide together whether your overall risk warrants more than you are doing now. That is precisely what the Maryland law asks for, and it is exactly the conversation I want more women to have.

Where this is heading

Maryland is first, and I doubt it will be last. Reporting what is already visible on tens of millions of mammograms every year, at no added cost or radiation, is the kind of quiet, sensible idea that tends to spread once one state shows it can be done without alarming patients. For a field that has spent decades under-recognizing heart disease in women, a routine test that hundreds of thousands of women already get, quietly handing each of them a personal heart signal, is a real step forward.

If your next mammogram report mentions breast arterial calcification, do not file it away. Bring it to your next visit. It may be the most useful sentence in the whole report.

Frequently Asked Questions

Does breast arterial calcification mean I have breast cancer or a higher risk of it?

No. Breast arterial calcification sits in the wall of the arteries, not in the breast tissue, and it has no link to breast cancer or to breast cancer risk. It is a cardiovascular signal that happens to be visible on a breast X-ray. Radiologists distinguish it easily from the tissue calcifications they look at when screening for cancer.

Is it the same as a coronary calcium score?

No, though they rhyme. A coronary calcium score measures calcified plaque in the heart’s own arteries, the lesion that causes heart attacks. Breast arterial calcification measures calcium in the muscle layer of the breast’s arteries, a related but different process. Both are pictures of aging arteries, and both can prompt the same protective steps, but a woman can have one without the other. If your mammogram shows breast calcium and your risk is unclear, a coronary calcium score is a reasonable next test.

My report mentioned it. What should I do first?

Bring it to your primary care doctor or cardiologist and ask three questions: What is my LDL cholesterol? What is my blood pressure, measured properly? And given those numbers, should I be doing more to protect my heart? The finding is a prompt to act on the basics, not a cause for fear.

How common is breast arterial calcification?

Common, and more so with age. It appears in roughly one in six to one in four women across all screening mammograms, in fewer than one in ten women under 50, and in the majority of women past 70. Finding it is ordinary, especially after menopause.

Will my mammogram report tell me about it?

In Maryland, starting October 1, 2026, yes, by law. Elsewhere, it depends on your imaging center. Some health systems already report it voluntarily. If yours does not, you can ask the radiologist or your doctor whether breast arterial calcification was seen on your images.

Can I make it go away?

The calcium itself does not reverse, and that is not the goal. The goal is to lower the risk it points to. Controlling cholesterol and blood pressure, staying active, eating well, and not smoking all reduce your future heart risk regardless of what the calcium does.

References

1. Adrejiya P, Bhanushali A, Mehta K, Amin M, Velarde GP. Breast Arterial Calcification on Mammography and Cardiovascular Outcomes in Women: A Meta-Analysis. The American Journal of Cardiology. 2026.

2. Christensen E, Hillenbrand C, Kutty A, et al. A Systematic Review and Meta-Analysis of Breast Arterial Calcification and Its Association With Cardiovascular Disease and All-Cause Mortality. The American Journal of Cardiology. 2026.

3. Nerlekar N, Soh CH, Vasanthakumar S, et al. A Novel Breast Arterial Calcification Age-Based Percentile Nomogram for the Incremental Prediction of Incidental Cardiovascular Events. JACC: Cardiovascular Imaging. 2026.

4. Bui QM, Daniels LB. A Review of the Role of Breast Arterial Calcification for Cardiovascular Risk Stratification in Women. Circulation. 2019;139(8):1094-1101.

5. Iribarren C, Chandra M, Lee C, et al. Breast Arterial Calcification: A Novel Cardiovascular Risk Enhancer Among Postmenopausal Women. Circulation: Cardiovascular Imaging. 2022;15(3):e013526.

6. Allen TS, Bui QM, Petersen GM, et al. Automated Breast Arterial Calcification Score Is Associated With Cardiovascular Outcomes and Mortality. JACC: Advances. 2024.

7. Parikh NI, Cacciabaudo JM, Singh VP, Vincoff NS. Giving Women What They Want: Reporting Breast Arterial Calcification on Mammograms at Northwell Health System. JACC: Advances. 2025.

8. Dapamede T, Urooj A, Joshi V, et al. Artificial Intelligence-Based Quantification of Breast Arterial Calcifications to Predict Cardiovascular Morbidity and Mortality. European Heart Journal. 2026.

9. Grundy SM, Stone NJ, Bailey AL, et al. 2018 AHA/ACC/AACVPR/AAPA/ABC/ACPM/ADA/AGS/APhA/ASPC/NLA/PCNA Guideline on the Management of Blood Cholesterol. Journal of the American College of Cardiology. 2019;73(24):e285-e350.

10. Maryland General Assembly. House Bill 1364: Mammography Reports, Breast Arterial Calcification Notification. 2026 Regular Session. Effective October 1, 2026.

Published on damianrasch.com. The above information was composed by Dr. Damian Rasch, drawing on individual insight and bolstered by digital research and writing assistance. The information is for educational purposes only and does not constitute medical advice.