What does it mean to have "dense breasts?".
D001940:Breast / Q000473:pathology*; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008327:Mammography; D012306:Risk; D016387:Women's Health