Radiologists don't diagnose..they just report what they see in the MRI, and it's up to the doctor to diagnose, or determine whether there is change or not, or whether there is something different to diagnose with you.
Lesions can seem to disappear. Lesions can ALSO remain the same -- a GOOD thing, because it means your MS is stable for now. And different MRI's can show up different lesions, or lesions that appear on one may not be on another.
Presumably you still have some symptoms? The abnormal T2 signal indicates there is some damage somewhere...so it's still likely that your MS diagnosis will stand. But you will need to discuss all of this with your doctor.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....