Biopsy is common practise if MRI is inconclusive. Most of the time the biopsy comes back clear so try and remain positive.
All the best
thanks for for your post I appreciate it, I am starting to feel positive and not so worried as am sure it will come back clear xx
I had the same thing three years ago and I was so scared (and the docs were so convinced it was a recurrence) that I didn't even want to have the biopsies.
It's a good thing I had them after all, because it turned out to be some sort of fibrosis, which gradually disappeared from the PET scans.
So good luck and try to stop worrying.