Did it happen before or after X-Rays. If after X-Ray, then I would believe that something might have flagged in your X-Rays. I remember my doctor asking me to take deep breaths in and out when she asked me to. She told that if the machine does not flag anything, then they won't do detail test.
I also remember the same panel physician also did tests for AUS, NZ and US immigration. AUS and NZ are exactly the same like Canada. For US, there was one additional test, which I am unfortunately not able to recall at the moment.
Additionally, I would also like to add that while I had my medicals done in Germany, my wife had hers in India, as she was vacationing back home when we were asked for medicals. Her experience was exactly like me, she only had to take her top off and was allowed to have bra on.
Although I really could not understand your apprehensions about a routine medical check up, I really do not think anyone of us here can assure you any more than what we have already done.
It is now up to you to decide if you want to proceed or not.
