My MRI report read that I have a "congenitally small thecal sac". I have no idea exactly what that means, and my doctor never explained. I've had two surgeries in the last seven years for herniated discs, but still suffer from (sometimes severe) back pain. I need to exercise but don't know how to do that with this back pain.
Though I am not sure about the term, this could mean a slightly narrower spinal canal, where symptoms may tend to be slightly more than expected. With acute back pain I would suggest rest for a few days followed by physiotherapy to strengthen the muscles around the back.
Hope this is helpful.
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