Unless its widespread and/or very obvious, an MRI, CT or x-ray cannot in itself show actual malignancy. That's done by biopsy. That said, they can show something of concern and worthy of further investigation. In my case, physical exams indicated issues, the scans affirmed them and the biopsy confirmed it. That's apparently not the case with you. What was shown is very common and very, very, very rarely turns into anything sinister.
A second opinion is up to you and your anxiety
Positive thoughts