Information obtained from a breast physical examination alone often is incomplete. Breast sonography, used in conjunction with a physical exam and/or a mammogram, can identify cysts, tumors, abscesses, lymph nodes and very dense breast tissue. In some cases, a tissue sample (biopsy) of a suspicious area is necessary to make a specific diagnosis. If a biopsy is needed, sonography can be used to guide the needle without the need for surgery.
Aspiration (removal of fluid) of breast cysts is also commonly performed using ultrasound guidance. Breast ultrasound is typically performed in conjunction with a mammogram.
More information on breast imaging