What is UAE law regarding old scarring on lungs...

We would like to inform you that if you have reside in the country for this period and you want to renew the visa, yes, the medical examination will be done for you
Regarding the scars on the lungs and the medical report is proven to be cured and disease-free, your legal position is good and you can renew the visa unless the health committee decides otherwise.
This is generally if you have any other inquiry you may clarify