What is Breast Needle Localization? Breast needle localization is a diagnostic procedure by which a special wire and x-rays are used to identify the precise location of abnormal breast tissue for the purpose of performing a breast biopsy. Radiology Associates does Localization three ways: Stereo Grid (mammogram) Ultrasound How do I prepare for Breast Needle Localization? Any medication you are taking, including aspirin, should be discussed when you make your appointment. The day before the procedure, do not eat or drink after midnight. A two piece outfit and bra should be worn. Jewelry is best left at home. Please arrive at the Breast Center 20 minutes before your appointment. What can I expect during Breast Needle Localization? A breast needle localization takes approximately one hour. Before the procedure begins, you will need to remove your clothing from the waist up and put on a gown. The technologist will help position you on your abdomen on a special x-ray table, seat you upright in a special chair or position you on your back on a table if the localization is to use ultrasound. If you are lying down, your breast will be placed through an opening in the table. Your breast will be compressed and a mammogram performed. This allows the radiologist to locate the suspicious areas. The radiologist will numb the breast tissue with a local anesthetic. You may feel a pinch at this time. The radiologist will then place a fine wire into the area of the lesion. The wire is taped to your breast. Additional x-rays will be taken. You will then proceed to surgery where the surgeon removes the suspicious area.