Breast MRI (Magnetic Resonance Imaging) is a highly specialised non-invasive scan that uses magnetic fields to determine what the inside of your breast looks like. The scan does not involve radiation but requires you to lie flat on your stomach for up to one hour in the scanner. Although the scan is very sensitive at detecting breast cancer it can also give rise to a number of uncertain findings that may require additional investigation. As a result it is currently only recommended for breast screening in women with a very strong family history of breast cancer, as an additional investigation in women with clinical or mammographic abnormalities, or prior to breast cancer surgery.