I wouldn't ask her to come along - wouldn't even mention it, unless she asks, other than to say by way of FYI you have another appointment. Asking her to come would be pursuit.
I very recently had a health scare. I'm an ex smoker. I went to the dentist a few weeks ago, and he noticed a 'lesion' at the back of my mouth. He didn't say it directly, but the concenred looks, all the Q's he asked related to my smoking history, bringing 2 colleagues in to have a look, and then scheduling me for another appointment to check again, caused immense turmoil for me.
I'm all clear now, but I didn't say anything to my XW at any stage whatsoever.
Good luck buddy. Regds D
Me: early 40's XW: nearly 50 T: 15 M: 5 BD: Jan 19 S:10 SS: 22 SD: 24