I had mri because the surgeon thought my tumour was bigger than what showed on mammogram and ultrasound. I was only the second patient to have one on the new machine at my hospital and was charged $618 and this was not covered by Medicare but decided to do it as my surgeon felt it would be beneficial. I think it is becoming more common for women with dense breast tissue like me. My tumour was thought to be 3cm on ultrasound/mammogram, but was thought to be 9cm on mri. The breast care nurses seemed very surprised that I had had an Mri. I got the impression it was very unusual.