Thank you for the answers!
Yes, at first some of the pictures were taken without contrast and after that some with, I guess that’s the cause for all the white spots. Of course I can do more screenshots showing my profile, I’m gonna post them in a few minutes. I hope I’ll pick the right pictures, it’s difficult to understand for me because of the language difference.^^ I would upload all MRI pictures if I were able to, but this strange viewing software won’t let me and the files on the disc aren’t just pictures.