Mammographic breast density; endocrine therapies, and breast cancer risk

摘要

The breast is composed of 3 main tissues: fat, fibrous/connective tissue, and epithelial tissue. Differences in the relative amount of these tissues result in variability between individuals in the radiologic appearance of the breast on the mammo-gram. Fat is radiolucent and appears dark on the mammogram, whereas epithelium and connective tissue are radio-dense and appear light on the mammogram. Mammographic breast density (MBD) reflects the appearance