The hormone therapy has brought your PSA down and may have actually shrunk the metastasis as well. I know at least a couple of people that have had lung metastasis that could not be found any longer after being on ADT for a while. Doesn’t mean they went away completely, they just became so small they couldn’t be seen any more.

When they found a metastasis in my spine, they wanted an MRI to see where the metastasis was exactly. I then had three sessions of SBRT radiation on it, to eliminate it.

You could ask about getting an MRI on your spine to see if that shows anything, The hormone therapy may be hiding something that’s there, and it could be zapped if the MRI shows where it’s at now. Having a metastasis on the spine can weaken the area it is in.

Your PSA is probably too low to see metastasis now, an MRI can usually still see what’s there.