Sometimes how bright or solid the spot is depends on how active the inflammation is, and how old the spot is. It also (as far as I know) makes a difference if the scan is done with contrast dye. If contrast is used, then active inflammation will light up bright and clear.

Older spots tend to fade over time, although the residual damage can remain in clinical terms. For example. my MRI's show dozens of faded, older lesions, but I still have symptoms (admittedly not as badly as when they were super bright) - even though my disease process is not 'technically' active right now.

I hope that makes sense - and if someone else reads this, and I have it wrong, please feel free to correct me.

Regards

Lyn