Your doc needs to weigh in on that, but normally your PSA level is now a good and accurate indicator. You can do a 3T mp-MRI, and/or a PSMA PET-CT, if there is suspicion.
But let others weigh in on that (e.g. Tall_Allen) - and a good doc should be able to walk you through that. If you don't like his explanation - find another (better) doc.
A bit of advice, Tall_Allen is obviously PCa "advanced informed" and dedicated forum member that has/is contributing at a high level here for all of us.
But, when you call out a specific member, then others that may have feedback, will pass on responding. so please let the forum openly respond.
I've been a software forum member for many years, this is just curtesy feedback based on my experiences.
I love you Tall_Allen, just an open forum feedback...
I am confused by your post. Are you saying that the cancer spread to your SV after you had RT and ADT to cure it? Are you saying that your PSA is undetectable after this new tumor has appeared after treatment? Perhaps it would clear things up if you were to provide the approximate dates of those diagnoses and treatments.
You should be listening to a radiation oncologist, not a urologist. The time to investigate with CT or other scans is after PSA has increased to more than 2.0.
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