I have had lower back pain for 4 years, it has now spread to lower back, upper back,arms,neck and legs. I have had 4 previous MRI's the last one stating that I have a 3mm tumor on L1 nerve sheath. My current MRI does not say anything about the tumer but, had a new term I do not understand. The results are: At L5-S1, Disc Dehydration in the small midline disc bulge are present (knew about this from previous MRI's), however the central canal or neural foramina is significantly compromised. This part is new, and I do not understand what it means. Please help.