Ultrasound is used in the breast to evaluate certain types of abnormalities that are felt on physical exam or seen on a mammogram. It is a useful adjunct to mammography, helping to determine if a lump or mass is an innocent fluid-filled cyst or a solid abnormality which may require further investigation. However, it cannot be used as a replacement for a mammogram since calcifications (often the earliest sign of a breast cancer), do not usually show up well on ultrasound. While there are some research projects currently being conducted to evaluate ultrasound as a secondary screening test for masses in certain situations, this is not currently recommended by the American College of Radiology and is not offered by Northside Hospital / Northside Radiology Associates, P.C.