Respectfully my personal experience partially refutes the opinion of your oncologist. My PSA was 0.44 after RP. PET-PSMA clearly showed lymph node involvement. It is my understanding however that cancerous lesions may not show up on a scan if they are less than 10 cm in any direction.

I hope you’re being treated at a center of excellence. If you’re not or don’t have confidence in your own oncologist, I suggest that you consider investigating another care provider. Best wishes for success on your journey.