That explains a lot.
" These lesions then shrink over time most likely due to scarring, and in humans, these lesions reach a plateau around 6 months after the RF91 and 3 months after the MRIgFUS interventions.65 92 93"
jnnp.bmj.com/content/89/7/7...
researchgate.net/publicatio...
(You can find a blow up of this graph in the link.)