### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Lower back pain with problem with legs. MRI findings: 1. Marked anterior marginal Osteophytic lippings in L1 to L5 with bony bridging and fatty change. 2. Mild degenerative changes are seen in all lumbar intervertebral discs as evidenced by reduction in bright signal intensity of nucleaus pulposus on T2 weighted sagittal sections. 3. Posterior disc bulge is seen at L4-5 causing marked narrowing of both nerve roots. 4. Mild disc bulge is seen at L5 - S1 level causing minimal narrowing of both nerve roots. 5. Available Central Canal AP diameter are : Level Canal APD (mm) D12-L1 12 L1-L2 12 L2-L3 11 L3-L4 11 L4-L5 10 L5-S1 10 6. Central canal is adequate in diameter with no evidence of any stenosis. 7. The Lower end of spinal cord and conus medularis are normal.Conus ends at D12 - L1 level. 8. CSF demonstrates normal signal intensity. 9. No pre/paravertebral soft tissue mass is seen. 10. Impression: a) Posterior disc bulge at L4-5 level causing marked narrowing of both nerve roots. b)Mild disc bulge at L5-S1 level causing minimal narrowing of both nerve roots. c) Gross lumbar spondylosis.

### output:

Hi, I am Chat Doctor.  I have read your question and understand your concerns. Let me try to help you Question 1 : What does my MRI of the spine indicate? Answer 1 : This indicates that you have a disc prolapse in L4L5 Level. Disc is a cushion between two vertebrae. In your case, it has slipped and come into spinal canal and is compressing the nerve roots. If you are having (1) Numbness or (2) Weakness, you need to undergo surgery immediately If there is pain, you can continue non-operative treatment for some more time and see whether the pain reduces Hope you found the answer helpful. If you need any clarification / have doubts / have additional questions / have follow-up questions, then please do not hesitate in asking again. I will be happy to answer your questions. Let me know if I can assist you further. Take care.