Statement: A patient presenting Glomerular filtration rate of 63 and with BI-RADS category c breast tissue would be eligilbe for the primary trial.
Primary_evidence: Inclusion Criteria:   Signed informed consent   At least 19 years old   Glomerular filtration rate> 60   Heterogeneously or extremely dense breasts (BI-RADS category c or d). Exclusion Criteria:   History of iodinated contrast allergy   Pregnant or lactating as determined by routine standard practice   Personal history of breast cancer   History of prior breast excisional biopsy (Patients with a history of core needle biopsy will not be excluded)   History of prior breast reduction mammoplasty surgery   History of prior breast augmentation surgery   Mental condition rendering the subject unable to understand the nature, scope, and possible consequences of the study.