Not sure why you would be worried? It seems that the chemo has knocked the tumour at L4 into submission, or at least it has shrunk enough not to be seen on a normal MRI which is entirely possible (as you say it took some fancy machines to diagnose it at all!)
The PSA result is fantastic - it is easy to assume that every ache and pain is to do with the cancer but perhaps he just has a normal back problem, is sleeping awkwardly, sitting down much more than he used to, has been lifting heavy items or has some kidney infection? Worth a chat with the GP I think.
"Life can only be understood backwards; but it must be lived forwards." Soren Kierkegaard
Did he have a Gallium 68 PSMA scan in London privately (£2600)? That is about the most advanced scan around.
Look it up.
Best of luck.
With a PSA of 0.006 and following advice I recently had they would in all likelihood be wasting their money. As Lyn says whatever was seen previously on the spine seems to have been dealt with by the HT/Chemo if indeed it was PCa in the first place.
Jennie the results so far sound positive and it looks like the treatment is working well
Yes he had one last December and that said the L4 was metastic but the CT scan this time said they couldn’t see any