Welcome @gilledrv, I'm not a doctor but I think the treatment may depend on your symptoms, amount of pain and other health considerations that can only by having a discussion with your doctor or a spine surgeon. Here's some information on spinal cysts from Johns Hopkins - https://www.hopkinsmedicine.org/health/conditions-and-diseases/spinal-cysts.

It sounds like you may have recently had an MRI that shows a synovial cyst. Has your doctor provided any treatment suggestions or information?