Mammograms have long been the gold standard for breast cancer detection, but they're not perfect. They can be less effective in women with dense breasts, which contain more glandular and connective tissue than fat.

Many states now require women to be notified when dense tissue is seen on a mammogram. Some states also require supplemental screening, like ultrasound, even if the mammogram found no cancer.

In this segment, Dr. Lusi Tumyan discusses breast density as a risk for breast cancer and the latest screening indications for women with dense breasts.