@brianjarvis Yes, a friend who underwent SBRT was told by his radiologist at Sloan that ‘seeds’ could be done if there was a recurrence.
Don’t know if he was using the word ‘seeds’ to mean HDR or LDR and my friend didn’t ask.
But I guess any modality is on the table; as you say, it all comes down to size and the precision of treatment. Best,
Phil