Usually addition films will be taken. This is called a diagnostic mammogram. If the mammogram is still not clear, the doctor may do a breast ultrasound using sound waves to see the area better. Many new techniques are becoming available for additional diagnosis before biopsy. Since most biopsies are benign (NOT CANCER), new methods are being tested to see better. Some of these are, MRI, PET scanning, and optical imaging. Optical imaging offers 3-D views of the breast and may be helpful to look for Angiogenesis, which is new formation of blood vessels in the breast that supply tumors.