Illinois Public Act 100-0749 was signed into law in 2018 and requires health professionals to notify individuals via a summary of the mammography report if the mammogram indicates the individual has dense breast tissue. The law requires notification only, and does not establish any other obligations for a physician or the healthcare team.

Breasts are considered dense if there is a relatively high proportion of fibrous or glandular tissue to fat in the breast. Dense breasts can only be identified via mammography. Radiologists are trained to assess breast density along with identifying breast abnormalities, when they read a mammogram.

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