Sonomammography or breast ultrasound is a non-invasive procedure performed to assess the breasts and the blood flow to areas inside it. This test can be used to avert unnecessary biopsy either by excluding a focal mass or by revealing clinically unsuspected malignancy ,when x-ray mammography shows moderate or marked density in patients complaining of a breast lump or modularity. Regular breast screening examination are necessary along with ultrasound of breast to help detect early symptoms of breast cancer.