My son had bright spots on his MRI and they were described this way... artifacts.

Bright spots on an MRI can sometimes be what are termed "artifacts". There are many reasons for them apparently.

If you look up artifacts and MRI, you can find all the extremely complicated and detailed reasons why these occur including motion of the patient or signal of machine.

Even things like makeup that contains cobalt or metal clips in the body can cause artifacts. Radiology is a speciality and it's best for that person to read the MRI and report back to your doctor.