Women the age of 30 or over who are undergoing screening or diagnostic breast imaging as an out patient at the Scripps Polster Breast Care Center in La Jolla, CA, with at least 5 years of historic breast imaging data available will be eligible to enroll. For this study, consecutive subjects who have completed screening or diagnostic breast imaging at the Scripps Polster Breast Care Center will be enrolled for one day. It is estimated that up to 5000 subjects will be included in the cohort.
