I raise you the guy who removed his own appendix in the jungle after escaping from a prisoner of war camp: https://www.smh.com.au/culture/books/the-war-hero-who-remove...
Before you go, they do as much as possible to ensure you won't have medical issues once you get there. One of the things is that they strongly suggest you get your wisdom teeth taken out. The guy I know did so a few weeks before leaving.
It turns out that his dentist was less than competent and he left parts of the tooth in the gum during extraction. So he gets to McMurdo, starts having really bad pain in his mouth, goes to the doctor and is told that his mouth is infected and teeth will need to be extracted.
The doctor reassured his patient with the words "Don't worry! I once took a one-day course in dentistry!"
That seems to fall under the "If it ain't broke, don't fix it" category -- if he was an adult with no prior issues from his wisdom teeth, he'd have been better off either leaving them alone, or having them removed 6+ months prior. I'm surprised they let him do it just a few weeks ahead.
More info: https://books.google.com/books?id=sR5Cm_zeIekC&lpg=PA84&ots=...
The airplane guy had more complications than ruptured lung but apparently he had just came out of scuba diving into the plane.
https://en.m.wikipedia.org/wiki/Leonid_Rogozov#Antarctic_ser...