June 11, 2025 — So you've ticked off your annual mammogram from your health checklist. That's a big sigh of relief, right? But hold on, don't rush off just yet. After you get your results, there's a crucial next step you shouldn't skip: check your report to see if you have dense breast tissue. You might be surprised to learn that over 40% of women do. If you're in that group, it's worth thinking about additional testing. But where do you even start? Two recent studies have compared the options for you. Let's dive in.

### Why Dense Breasts Matter

Dense breast tissue not only ups your risk for breast cancer but also makes it harder to spot the disease. Why, you ask? Well, dense breasts are packed with more fibrous tissue and milk glands compared to fat. On a mammogram, these dense areas appear white—just like cancer does. This similarity can make it tricky to detect cancer, especially when it's small. Thanks to federal law put into place last fall, you'll be informed if your mammogram shows dense breasts. To double-check, you can always peek at your patient portal or give your doctor a call.

It's also vital to know whether your breasts are categorized as "heterogeneously dense" or "extremely dense." What's the difference, you wonder? "Heterogeneously dense" means your breast is mostly dense with a few fatty areas, while "extremely dense" means there's little to no fatty tissue. Keep in mind, breast density can decrease with age, especially around menopause, so it’s a good idea to check your report every year. Remember, only imaging can confirm breast density—physical exams can't.

### Should You Consider Additional Screening?

If your breasts are dense, you might want to explore supplemental screening. Why is this important? Well, standard mammograms miss about 25% to 30% of cancers in heterogeneously dense breasts. For extremely dense breasts, the number is even higher, potentially surpassing 40%. So, it’s crucial to stay informed and proactive.

As Ruth Etzioni, PhD, a biostatistician from Fred Hutchinson Cancer Center in Seattle, puts it, "Women should know that if they have dense breasts, the mammogram might not see their cancer." This insight into the complexities of cancer screening highlights the importance of understanding your own breast density.

Navigating the world of breast health can feel overwhelming, but remember, you're not alone. Keep asking questions, stay informed, and discuss your options with your healthcare provider. After all, knowledge is power, especially when it comes to your health.