I had an acoustic neuroma - benign tumor - removed from my hearing nerve 16 years ago now. It is benign but slow-growing, so I was fortunate that it was caught when it was still very small. I had already lost some hearing in that ear anyway, which is how it was discovered, and after the surgery am deaf on that side, but it was worth it to get it removed before it grew and caused bigger problems.

And now I don't get motion sick, which before I did very easily. So there's an upside!