@mjp0512
That is a real serious problem with your prostate. It does look like they did not completely zap what was there?

Yes, they can do the L5 for sure they did my L4. They wanted to do it in three sessions because it was wrapped around my L4 and they didn’t want to put it too much radiation on all at once.
Here are some answers about what to do for the prostate that is reoccurring. There are doctors that are trained in using surgery to treat prostates that have reoccurrence after radiation. I know the Mayo Clinic has many doctors that can do this. If you can’t get to them, there are other places that have doctors that specialize in doing that.

People who have radiation as their primary treatment have been told by doctors that surgery isn’t really an option if there’s a reoccurrence. Other options are not really mentioned..

This study shows that both salvage focal therapy (HIFU and cryotherapy) and salvage surgery were equally effective at extending the life of a patient that started off with radiation.

Those that had focal therapy had fewer perioperative complications.
https://jamanetwork.com/journals/jamaoncology/article-abstract/2844900