Ultrasonography uses sound waves to obtain a medical image or picture of various organs and tissues in your body.  Ultrasound produces very precise images of your soft tissue, such as the heart, blood vessels, uterus, bladder, etc.  It also reveals internal motion, such as your heart beat and blood flow.  It can detect diseased or damaged tissues, locate abnormal growths and identify a wide variety of changing conditions.  This enables your doctor to make a quick and accurate diagnosis.  However, an ultrasound is not believed to be an accurate screening tool for breast imaging.  But it serves an important role in distinguishing cystic versus solid masses.  Indications for ultrasonography include a palpable lump or a persistant nodule seen on mammography.