Larry,
I had my surgery November 30, 2010, and I do not expect to have a reoccurrence of my symptoms. It is unknown if my cyst was "pre-existing", but it became symptomatic as a result of trauma to the spine, an impact injury.
My accident occurred on March 10, 2006, and I spent the next several years searching for a "cure". I had been told to "just accept that (you) will never recover from this ...." No, I wouldn't accept that. Slowly, radiologists, neurologists, urologists, and others in the medical community are beginning to accept that Tarlov/perineural cysts are not just an "incidental finding".