Anaesthesia And TB? A huge complication?

Father has a hip fracture and scheduled for a surgery tomorrow. But he was also a TB patient a year back. He has completed his medication for TB and he doesn't show any signs of TB. During the prep of the surgery, they found a infected area on his lung which still has TB. Doctors are saying this presents a problem for the surgery and the anaesthesia that they plan on giving. Even before doing the surgery, they have warned us about the need of an ICU for the TB since they plan on using General Anaesthesia during surgery. What do I have to keep in mind? Is there a moderate risk or is this a huge complication? I am confused. And I am financially not quipped to handle a ICU Scenario. Someone please advise.