Wayne ~
I wouldn't lose any sleep over the possibility of developing a CSF leak 2+ years post-op. Frankly, once I passed the initial post-op healing stage (approximately 6 weeks) I never gave a CSF leak any thought. I believe the statistics show a 10-15% chance of a post-op CSF leak within the first few weeks of the surgery. I can't verify this but years-later CSF leaks must be extremely rare because there is little information available about them. That doesn't mean they don't occur, just that the possibility of this happening are practically infinitesimal. I'm well over four years past my AN surgery (retrosigmoid) and I'm not concerned about a CSF leak, although I do realize that, like winning the lottery, it could happen. Information is always valuable but occasionally, too much information can be perplexing.
Jim