So when I was sent on a course to do with computers in Paris, I said that my French was up to it. Wrong! My presence on the course was seriously disruptive, because French technical jargon (which I didn't learn at age 6) is unrecognisable to people who haven't learned that jargon in France (nobody else uses it).
For instance, Chinese/Eastern medical jargon is objectively more readable than Western terms (unless you are fluent in Greek and Latin), but that doesn't mean you'll be able to understand them without some prior exposure.
French is also spoken outside of France.
I assumed doctors everywhere had built an informal consensus to use English, with terminology derived from classical greek; rather as pilots and air-traffic controllers all use English.