Hi Habeaves, I take it you just had the RT without any HT?
I had salvage RT last March/April but was on PROSTAP for 3 months prior to RT and will be on it for two years after so until April 2019.
My oncologist told me he thinks I have micromets but we won't know any more answers until I come off HT.
I would think that scans would be in order first. MRI and a PET/CT scan would be able to pick up anything going on with a PSA of 18.
Then the MDT/oncologists would decide on an evidence based plan of treatment depending on the results of the scans.
Because you've had RT already as AC has said it will likely be a systemic approach now involving HT and possibly early chemo.
Best wishes, Ian