Why is it important that women know if they have dense breasts?

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DrAttai (Physician - Surgery - Breast (Verified) ) - 09 / 25 / 2011

Dense breast tissue causes 2 problems - one is that it is now known that women with dense breast tissue have a higher rate of developing breast cancer, and the second is that breast cancer is harder to detect in women with dense breast tissue. Mammograms will miss 10-20% of breast cancers, more often in women with dense breast tissue. Ultrasound and MRI examinations can be performed in addition to a mammogram, but no test is 100% sensitive and specific for diagnosing breast cancer. Ultrasound and MRI are also more difficult to interpret in women with dense breast tissue, just like mammograms. MRI in particular also has a relatively high (up to 20%) false positive rate - it will often show things that look suspicious and require further investigation and sometimes biopsy, and the finding then turns out to be normal - these are some of the reasons that MRI is not recommended as a general screening test for all women, but rather is recommended for use in specific situations.

I do feel that women should know their breast density - "lumpiness" on exam is not the same as dense breast tissue. This information is generally included in the formal mammogram report provided to the ordering physician, but is not required to be included in the "lay letter" - the letter that gets sent to the patient (the wording of the reports and the lay letter is regulated by the FDA under the Mammography Quality Standards Act:http://www.fda.gov/Radiation-EmittingProducts/MammographyQualityStandardsActandProgram/Regulations/ucm110906.htm#s9004

Connecticut and Rhode Island have passed legislation requiring that the patient be informed of her breast density, and this is pending in California as well.

There are no uniform recommendations for how to provide increased screening to women with dense breast tissue, but at the very least, make sure that when you get your mammogram, you get a newer digital mammogram, rather than an older, film-screen - you just need to ask the facility and they will let you know. The use of ultrasound and MRI should be discussed with your physician or breast specialist and will take into account your family history and other breast cancer risk factors as well as breast density.
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