Michigan Dense Breast Notification Law
What You Need to Know About Your Mammogram Results
Under Public Act 517 of 2014, effective June 1, 2015, all mammography facilities in Michigan must inform patients if they have heterogeneously dense or extremely dense breast tissue. This information is included in your mammogram summary letter to raise awareness and help guide follow-up discussions with your healthcare provider.
A full report is also sent to the provider who ordered your mammogram.
What is Breast Density?
Breasts are made up of fibroglandular tissue (milk glands and ducts) and fatty tissue. The more fibroglandular tissue present, the denser the breast appears on a mammogram.
Why is Breast Density Matter?
Dense tissue can make it harder to detect cancer on a mammogram because both dense tissue and tumors appear white, which may mask abnormalities.
Dense breasts are also considered an independent risk factor for developing breast cancer.
How Do I Know If I Have Dense Breasts?
A radiologist determines your breast density when reading your mammogram. There are four categories:
- Category A – Almost entirely fatty (10% of women)
- Category B – Scattered fibroglandular tissue (40%)
- Category C – Heterogeneously dense (40%)
- Category D – Extremely dense (10%)
Your category will be included in your mammogram report.
What If I Have Dense Breasts?
If you have dense breasts, continue getting annual 3D (tomosynthesis) mammograms. It’s the only screening test proven to reduce breast cancer deaths—even in women with dense tissue.
You may also consider supplemental screenings such as:
- Breast Ultrasound
- Breast MRI
These tests can sometimes detect cancers not visible on a mammogram, but they may also lead to more follow-ups or biopsies. Talk with your healthcare provider to determine if additional screening is right for you. Insurance coverage for these services may vary.
U.S. Breast Density Statistics
- 10% of women have almost entirely fatty breasts
- 40% have scattered density
- 40% have heterogeneously dense breasts
- 10% have extremely dense breasts
MyMichigan Health is here for You
WE offer a full range of breast imaging services, including:
If you’ve been notified of dense breast tissue, talk to your provider—or contact MyMichigan Health—to explore the best screening plan for you.
