they will ask for further investigations if there is anything they are worried about?
Affirmative.
Dr. CY did my medical as well, very good doctor, even gave me a few hints on interview techniques! I have heard that they instantly terminate medical exams if they find things that are unacceptable and cannot be rectified. Having said that, if you passed the entire medical check-up, I would think you have a good chance of passing the Cathay medical altogether.