If there were ever a clear indication for immediate salvage radiation, this is it: significant positive margins on both the right and the left side (didn't your urologist mention this?) and GS8. He has confirmed detectable PSA that has never become undetectable. The Axumin scan is a good idea - there's no point in getting radiation if it has already metastasized.
I'm glad his recovery is going well. If you decide on adjuvant ADT, that will give him more time to recover more fully. The scans will tell you if the radiation field has to be widened to include the pelvic LNs.
No, it is not possible that the PSA is due to benign tissue that will dry up. You know what is causing it - cancerous tissue that was left behind.
Allen - not an MD
•PSA=7.3, prostate volume=55cc, 8/17 cores G6 5-35% involvement
•SBRT 9 yr onc. results
•SBRT 7 yr QOL results
•treated 10/2010 at age 57 at UCLA,PSA now: 0.1,no lasting urinary, rectal or sexual SEsmy PC blog