my MRI showed "white spots" too, that ended up not being anything to worry about. They had me go to a Dr. to rule out M.S. (scary), which I did, (and she did,) and at that visit, she told me that the white spots showed up on the MRI could be just enhancements because of the contrast dye (I'm assuming you had contrast - a shot during the MRI) entering blood vessels--and she likened them to those red moles people get sometimes. She said it was possible I had had them (I had two) all my life. I'm not saying that's what yours are, but if the doctor said they're nothing to worry about, it could be something that benign. If you're curious you can request your own copy of the MRI and/or report. It's your body. I don't know if that would ease your mind, but it might. I think knowing more is better. Then you could at least have a name other than "white spot"!

Good luck!