Q. What does posterior disc bulge at L4 to L5 intending thecal sac in spine scan indicate?

Answered by
Dr. Rohit. R
and medically reviewed by Dr. Divya Banu M
This is a premium question & answer published on Mar 24, 2019

Hello doctor,

Posterior disc bulge at L4 to L5 intending thecal sac, narrowing bilateral neural foraminae and mild abutting bilateral exiting nerve root.



Welcome to

I just went through your scans and read about your symptoms. I would like to tell you about the problem you are facing. As the age progresses the spine undergoes degeneration leading to narrowing of the canal leading to your problems. I would like to know what are your symptoms like back pain, lower limbs pain, shooting pain, numbness, unable to walk for long, difficult to sleep. The scans which you have sent does not show much of the disease. So, physiotherapy- back strengthening exercises like tablet Zerodol P twice daily, tablet Pan 40 mg twice daily, tablet Pregabalin 75 mg daily night. Have a good day.

The Probable causes:


Differential diagnosis:

Lumbar canal stenosis.

Probable diagnosis:

Lumbar radiculopathy.

Treatment plan:


Thank you doctor,

Symptoms are right lower limb is paining, back pain, while walking for a long time right leg is more paining. I am going to physiotherapy daily. Plus I have renal stones and left simple solitary cyst in the kidney. In bed, while turning to the right side is more hurting.



Welcome back to

The symptoms point towards lumbar canal stenosis as I have already explained. I would like you to give one month back and core muscle strengthening physiotherapy. Take the tablets I have given. Tablet Pregabalin takes a few days to act, so do not stop. Take it by 9 PM. A few people feel morning giddiness if taken very late at night. If any such symptoms occur, please follow up.

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