I have a 1cm 'spot' that only shows up on one view of the breast.
I was certainly put through the ringer this morning, though. The tech took three x-rays had me wait, then came back and took another one. Then I went in for an ultrasound----she took forever to take a bunch of pictures; then I waited while she showed the doctor...then she came in and did more ultrasound pictures----more waiting while the doctor looked. Another boob smoosh picture and I was finally told to go home and come back in six months.
Apparently this 'spot' is more dense than the rest of my breast tissue; but since it only shows up when I'm in a certain position it is not cancerous.