Ultrasound is an imaging test that sends high-frequency sound waves through your breast and converts them into images on a viewing screen.
Breast ultrasound has many false positive and false negative results [77,79]. A false positive result shows a woman has breast cancer when she does not.
Breast ultrasound is not usually done to screen for breast cancer. This is because it may miss some early signs of cancer. An example of early signs that may not.