What is some information about synovial cysts?

Not uncommon. When a joint becomes arthritic, it can produce more joint or synovial fluid in an attempt to heal itself leading to pressure build up in that joint with a bubble or hernia of synovium which is the joint lining leading to a cyst. When these occur in the spine, they can sometimes press on or pinch a nerve mimicking the symptoms of a disc herniation or contribute to spinal stenosis.