L5 S1 is at the base of your lower back,disc dessication (desiccation) is drying out of the disc between your last lumbar vertebra and your first Sacral vertebra. The inter-vertebral discs are composed of over 90% water content and they act as shock absorbers between the vertebrae. It can be from normal aging although there may be other causes. Lipomatosis is fat buildup or presence, possibly from prolonged use of corticosteroids as in pain injections or from other causes, and the thecal sac contains CSF fluid and nerve endings, pressure from one on the other may cause pain, numbness etc. I am not a medic of any kind and can only suggest you speak to your doctor and enquire. You may receive better replies here also. Good luck.
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