I have had some surgery in the past. One was for removal of an epidermoid cyst on the brain stem in 1989. I have logged over 1000 dives since and dove to over 100 feet on at least 100 dives with no problems. A few years ago, I had another procedure because I developed a CSF leak into my right middle ear as result of an erosive process from an improper meningeal closer from the first surgery. Everything went fine and I am no longer leaking. I have dove hundreds of times since, even to 125 feet with no problems. As long as I dive conservatively (well within limits) ,I feel that I am not really at an increased risk. Some say that I should have given up diving but to me, that's like asking to give up something that makes life worth living. It's my number one passion.