Should both mammogram and sonogram be done forlarge breasts?

Not necessarily: If the breast tissue is dense, it is often helpful to perform a directed-sonogram with a clinical breast exam and mammogram. On the other hand, MRI is also useful in the setting of increased risk of breast cancer or if the mammogram and sonogram aren't helpful.

Maybe: Each is good for a specific problem. Start with the mammogram and if no abn. Findings then sono not necc. If area of question, sono can tell diff. Between a cyst or mass.

An ultrasound: is not required on the basis of large breasts. In the screening setting, mammography alone is sufficient, unless of course there is an abnormality and a diagnostic work up is needed. In women with dense breasts, adjunct screening ultrasound may have some added value, but strictly on the basis of the size of the breasts, no.