Mammograms can sometimes fail to detect tumors in women who have a higher breast density. As a result, the FDA said it's planning new regulations for informing women about their tissue type and screening options.

Dr. Sarah Friedewald, the chief of breast imaging at Northwestern Medicine, explains that denser breasts have less fat and more tissue. It can be more difficult to spot tumors in dense tissue in mammograms, since both show up as white in the images.

"About 40[%] to 50% of the women in the country actually have dense breast tissue. It just makes it a little bit harder for us to find cancer on the mammogram," Friedewald said.

For one of Friedewald's patients, she said that they needed additional scans, an ultrasound and an MRI to detect a large cancerous tumor due to her breast density.

In the U.S., 38 states now require patients to be notified about their breast density.

If you're planning to get a mammogram, it's important to ask doctors about your tissue type. If additional tests are needed, make sure to get a medical order and check if your insurance company requires pre-approval and covers the cost.

More tests can cost anywhere between a few hundred to thousands of dollars.

Eve Feinberg, 48, gets screened for breast cancer every year due to her aunts being diagnosed at a young age. She said she pays around $2,000 out of pocket each year for an MRI after insurance coverage.

She insists, though, that it's worth it.

"Just to know that if something is detected, it will be detected at an early stage," Feinberg said.

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