Software for reading medical CD of MRI on Mac

I remember the CD my doctor gave has a viewer on it, if only I can remember where is that CD now… Probably a PC/Windows app.

Free ImageJ or FIJI might do the job to open DICOM package but could be intimidating if you are not used to it and/or not a very technical-minded person. It can even convert to STL but I guess you are not planning to do that.

Those are often DICOM format. DICOM viewing apps for macOS include  OsiriX, HOROS Project, and Miele-LXIV.

As I understand it not all medical clinics use the same software, so you need the correct one. That said, no doubt such software is beyond what we can afford.