Hi It's Regarding A MRI Scan On My Back.... My

Hi it's regarding a MRI scan on my back.... My L5 disc shows on previous scans as prolapsed and I've had 2 sets of injections to help with pain with no success. Just before my 3rd set of injections another scan was done and shows changes on the scan so injections are on hold whilst they investigate. The scan shows a lighter area around the disc that is now almost completely flat, it looks like a halo around the faulty disc. The doctors are talking about spine infections or possible cancer reoccurrence...(diagnosed last year with cc stage 1b1)... Any ideas on what this could be would be helpful as it might help me with questions to ask when I go back.... Thank you....Lis