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Screening & findings
Dense breasts, and screening when your risk is higher
Two situations where the standard screening advice may not be enough for you: a mammogram report that says your breasts are dense, and a family history, gene change, or past biopsy result that puts your lifetime risk above average.
Dense breasts, and what to do about a density notice
have more glandular and fibrous tissue and less fat. It is normal, it is common, it has nothing to do with how breasts look or feel, and you cannot find out any way other than a mammogram. Since September 2024 mammogram facilities across the United States have been required to tell you your density.
Density matters for two reasons. Dense tissue looks white on a mammogram and so does cancer, which makes a small cancer harder to pick out. And dense tissue is itself associated with a somewhat higher risk of developing breast cancer.
What to do about it is the least settled question in this whole field, and the same four organizations split again:
- The US Preventive Services Task Force says there is not enough evidence to recommend for or against extra ultrasound or MRI for dense breasts.
- The American College of Physicians suggests considering supplemental tomosynthesis, and advises against supplemental MRI or ultrasound for average-risk women with dense breasts.
- The American College of Radiology recommends that dense breasts be one input into a formal risk assessment rather than the whole answer, and that supplemental imaging be decided from overall risk.
The practical version: a density notice is information, not an alarm. Bring it to an appointment and have your overall risk worked out properly rather than acting on density alone.
Screening when your risk is higher than average
Some people should be screened earlier, more often, or with more than a mammogram. You may be in that group if you have a strong family history of breast or ovarian cancer, a known inherited gene change, a previous high-risk breast biopsy result, or radiation to the chest before about age 30.
The American College of Radiology recommends that everyone have their risk formally assessed by age 25, so that anyone who needs earlier screening is identified before the usual starting age rather than after. It notes this matters particularly for Black women and women of Ashkenazi Jewish descent.
For people who do turn out to be at high risk, the broad shape of the advice is consistent even where the details differ. The American Cancer Society recommends an annual alongside an annual mammogram, usually starting at 30, for anyone with a lifetime risk of roughly 20 to 25 percent or more. The American College of Radiology recommends annual mammography from 30 for those with genetics-based risk or a calculated lifetime risk of 20 percent or more, and notes that people carrying a gene change can delay mammography to 40 if they are having annual MRI from 25.
Working out a lifetime risk percentage takes a proper family history and a risk model. It is not something to estimate from memory. If any of the above sounds like you, that conversation is the appointment to make, and a may be part of it.
Write down the family history and bring it to your next appointment with your primary care provider. He or she can discuss the best options for finding out what your risk is, screening, and genetic counseling or testing based on the resources where you live.
The US Preventive Services Task Force notes that Black women are more likely to be diagnosed beyond stage 1, more likely to have cancers, and roughly 40 percent more likely to die of breast cancer than White women. Some of that gap is biology and much of it is delay in follow-up after an abnormal result. If you are told to come back for anything, come back.
Where this comes from
- American Cancer Society recommendations for the early detection of breast cancer
- US Preventive Services Task Force, Breast Cancer: Screening, Grade B for women aged 40 to 74
- Breast Cancer Screening for Women at Higher-Than-Average Risk: Updated Recommendations From the ACR, Journal of the American College of Radiology, 2023
- ACR and Society of Breast Imaging statement, 17 April 2026
- Screening for Breast Cancer in Asymptomatic, Average-Risk Adult Females: A Guidance Statement From the American College of Physicians (Version 2), Annals of Internal Medicine, 17 April 2026
- NCCN Guidelines for Breast Cancer Screening and Diagnosis
- US Food and Drug Administration, Mammography Quality Standards Act final rule, breast density notification required from 10 September 2024
Guidelines change. This page states what each organization said on the date above. If you are reading it long after that, check the links. Dr. Perkins’ advice on family history was added 13 September 2026.