Only an MRI can detect a synovial cyst.
A synovial cyst can grow quite large in the lumbar spine and can cause excruciating nerve pain in the legs.
These things are sometimes called "rare," but I have reason to believe they are underdiagnosed because insurance companies do not want to pay for MRIs.
Your back can look OK on an x-ray, but the soft tissue of a synovial cyst will not show up except on an MRI.
I hope you will Google synovial cyst lumbar spine and see it the information you find there might apply to your situation.
I wish you well.
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