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Understanding Breast Density

Breasts are made up of a mixture of fibrous and glandular tissue and fatty tissue. Your breasts are considered dense if you have a lot of fibrous or glandular tissue but not much fat. Density usually decreases with age. Breast density is determined by the radiologist who reads your mammogram and will be included in your imaging report. In fact, under the NJ Breast Density Law, reports must include information about breast density. The legislation also requires insurers to cover follow-up evaluations, such as ultrasound or MRI, in women with dense breast tissue.

Why is breast density Important?

Dense breasts do make it more difficult for doctors to spot cancer on mammograms. Having dense breast tissue may increase your risk of getting breast cancer

If I have dense breasts, do I still need a mammogram?

Yes, a mammogram is the only medical imaging screening test proven to reduce breast cancer deaths. Many cancers are seen on mammograms even if you have dense breast tissue.

What should I do if I have dense breasts?

If you have dense breasts, talk to your doctor. Together, you can decide which, if any, additional screening exams are right for you.

For a referral to a RWJBarnabas Health primary care physician or breast specialist, call 888-724-7123.

What New Jersey Law Regarding Breast Density Means for Patients and Physicians

As of May 1, a new law went into effect for the State of New Jersey regarding breast density, providing for additional screening coverage for women with extremely dense breasts.

Breast density on mammography refers to the relative density of fibroglandular tissue vs. fat. The greater the amount of fibroglandular tissue (seen as white on mammograms) vs. fat (seen as gray), the greater the chance of a breast cancer hiding from sight. Also, since breast cancer develops primarily from glandular tissue and ducts, the greater the amount of fibroglandular tissue, the greater the substrate for developing cancer.

The American College of Radiology defines breast density on mammograms in four categories:

  • Almost entirely fatty: 10 percent of women
  • Scattered areas of fibroglandular tissue: 40 percent of women
  • Heterogeneously dense tissue: 40 percent of women
  • Extremely dense tissue: 10 percent of women

Those women with "extremely dense" breasts have two times the risk of developing breast cancer than the average female population. As per the new law, those women with this category of density are eligible for additional methods of screening for breast cancer, covered by insurance.

The additional methods can help to detect cancer that may not be seen on mammograms. The main two supplementary methods are whole-breast ultrasound and breast MRI. Ultrasound is preferable for women with an average risk for developing breast cancer, while for women at high risk, such as women with a family history of breast cancer, MRI is a better choice.

Please note that these supplementary tests are in conjunction with and don't replace mammography, which remains the main screening tool.

Additional online resources include:

Saint Barnabas Medical Center
94 Old Short Hills Road
Livingston, NJ 07039
(973) 322-5000
Monmouth Medical Center
300 Second Avenue
Long Branch, NJ 07740
(732) 222-5200
Monmouth Medical Center Southern Campus
600 River Avenue
Lakewood, NJ 08701
(732) 363-1900
Clara Maass Medical Center
1 Clara Maass Drive
Belleville, NJ 07109
(973) 450-2000
Community Medical Center
99 Highway 37 West
Toms River, NJ 08755
(732) 557-8000
Newark Beth Israel Medical Center
201 Lyons Avenue at Osborne Terrace
Newark, NJ 07112
(973) 926-7000
Jersey City Medical Center
355 Grand Street
Jersey City, NJ 07302
(201) 915-2000
RWJ University Hospital Hamilton
1 Hamilton Health Place
Hamilton, NJ 08690
(609) 586-7900
Robert Wood Johnson University Hospital
1 Robert Wood Johnson Place
New Brunswick, NJ 08901
(732) 828-3000
RWJ University Hospital Rahway
865 Stone Street
Rahway, NJ 07065
(732) 381-4200
RWJ University Hospital Somerset
110 Rehill Avenue
Somerville, NJ 08876
(908) 685-2200
The Jacqueline M. Wilentz Breast Center at Howell
4013 Route 9
Suite 2S
Howell, NJ 07731
(732) 923-7700
The Jacqueline M. Wilentz Breast Center at Lakewood
600 River Ave
Lakewood, NJ 08701
(732) 923-7700
The Jacqueline M. Wilentz Breast Center at Colts Neck
310 Route 34 South
Second Floor
Colts Neck, NJ 07722
(732) 923-7700
The Jacqueline M. Wilentz Breast Center at Monmouth Medical Center
300 Second Avenue
Long Branch, NJ 07740
(732) 923-7700
Center for Breast Health and Disease Management - Westfield
560 Springfield Ave
Westfield, NJ 07090
(973) 322-7020
Center for Breast Health and Disease Management - Metuchen
173 Essex Ave
Metuchen, NJ 08840
(732) 494-0415
Center for Breast Health and Disease Management - Livingston
200 South Orange Avenue
Suite 102
Livingston, NJ 07039
(973) 322-7020
Community Medical Center Women's Imaging Center - Toms River
368 Lakehurst Rd
1st Floor
Toms River, NJ 08755
(732) 557-8146
Barnabas Health Ambulatory Care Center
200 South Orange Avenue
Livingston, NJ 07039
(973) 322-7000

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