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Abstract
Breast ultrasound is a valuable adjunctive to mammography for the identification and characterization of palpable and nonpalpable abnormalities. With the advances of ultrasound techniques over the past 10 years, the role of ultrasound has evolved from differentiation of benign from malignant masses, evaluation of mammmographic abnormalities, and guidance modality of interventional procedure to preoperative evaluation of lesion extent, follow-up after operation, and screening method for high-risk women. It can also be used as a supplemental modality of a physical examination and mammography to increase diagnostic accuracy and to reduce unnecessary surgical biopsy. This article is to review the indication of breast ultrasound examinations as well as merits and limitations compared to mammmography.
Figures and Tables
 | Figure 2Automated ultrasound systems.
(A) 3-D coronal image shows architectural distortion (arrow) in 11 hour direction of the left breast, 5cm apart from nipple.
(B) Axial image shows a 1.2cm sized ill-defined hypoechoic mass (arrows).
(C) Sagittal reconstruction image shows the taller-than-wide mass (arrow). Surgery revealed invasive breast cancer.
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 | Figure 3Elastography.
(A) A 0.7cm sized fibroadenoma shows normal strain within the mass.
(B) A 0.7cm sized invasive breast cancer shows no strain within the mass.
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 | Figure 4Breast cancer in dense breasts.
(A) Mammogram shows no definite mass. A metallic marker is attached to the palpable area (arrow) in the left breast.
(B) US images show a 1cm ill-defined hypoechoic mass (arrow) in the palpable area. This cancer is difficult to detect at mammography.
(C) US-guided core biopsy revealed invasive ductal carcinoma.
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 | Figure 5Intraductal papilloma. Breast US shows a complex cystic mass with echogenic solid component (arrow).
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