Brain met ??? Anyone have advice

[Benk]

Hi all
I have not need to post for a while we have been doing so well for my wife from stage iv at diagnosis inApril 2016 to NED last June 2018. Then scans last week showed “possible” brain met. Now all the fear has come straight back just like it was Initially when diagnosed.
We met radioncologist today to discuss grammar knife once an mri is completed
Can anyone advise if they have been in the same position ? Is it likely the mri will find more ?
They are saying more than 20 Mets means while brain radiation ??

Any advice or positive experiences would be appreciated

Thanks