I forget it's percentages, but it's higjly accurate to identify suspicions, but depends on the area being scanned, and some scans are better to use than others depending on that. MRI is usually good for soft tissue, vascular, nerve invasion, Lymph nodes, etc. and CT is good for bony structure, and others. The MRI is just as good, if not slightly better than a CT for identifying lymph node involvement. Sometimes doctors use a combination of scans for diagnosis if not satisfied with one or is inconclusive. The only thing that can really tell if it's cancer or not is a biopsy.

There is probably a link on OCF that describes the MRI better. and other imaging techniques used or use the search function.

Also, just as important is the interpretation of the scan by the RO or Technician to identify abnormalities, and their experience in doing so. If you have any concerns, ask the doctor. You can always get a 2nd opinion, if you get a cd of the MRI, and the report.

I hope this helps. Good luck with everything.