Is breast US, mammography or both ideal for women under 40 with focal breast symptoms?

Breast ultrasound should be used as the primary initial imaging modality when evaluating focal breast symptoms in women 30 to 39 years old, according to research published Oct. 9 in the American Journal of Roentgenology. Although mammography can detect symptomatic breast cancer, the researchers found its cancer detection rate (CDR) to be lower than that of ultrasound.