The devil is in the details. If your CT scan shows obstruction of the outflow path of the sinus (bony or due to chronic inflammation and polyp formation), then you are at risk for barotrauma. Sinus surgery opens up these pathways, so it can make diving easier, and make you less prone to barotrauma, especially if you have an upper respiratory tract infection. Not sure what your scan showed, or if both docs had looked at it.
I guess it comes down to how much you want to avoid ever having that problem with diving again. I can't really go into all of the risks and benefits over the Internet, without having any idea what is going on with your CT, but plenty of people have sinus surgery so that they can dive more easily.
I guess it comes down to how much you want to avoid ever having that problem with diving again. I can't really go into all of the risks and benefits over the Internet, without having any idea what is going on with your CT, but plenty of people have sinus surgery so that they can dive more easily.