Hi! had the same problem, did my medical exam 5 months ago, did the same to me to take a 5 different positions and after 3 days a mantoux/ppd test and result was negative. I have a scar on my left lung cause by trauma(stab wound) and a tube inserted was inserted in left lung to draw the accumulated blood within(this happened way back 2005). I explained this to the attending physician and they told me that there's no problem in my case. Yesterday as we renewed our medical certification for baladiya and give me a receipt with a note of "Visit: Xray" and today I received a message from SCH MC that I need to visit the xray section. and now I'm getting worried that they will perform xray to me again because I know that I really have a scar on my lungs and go under test again in that span of 6months since my last exam.