I'm really concerned about my uncle who is 60 years old. He's been having mild fever on and off and he's also lost some weight recently. I know he has a history of smoking, which worries me more. We got an AFB test, and it came back negative for TB, but his chest CT scan showed some serious stuff. There are a few nodular areas of consolidation in his lungs that have irregular margins and some of them show central necrosis. They also mentioned something about fibrotic pleuroparenchymal bands. The report suggests it might be an infectious process like TB, but they also said we cant rule out cancer without a biopsy. There are also some small nodular lesions in his right upper lobe and left upper lobe, and the CT scan mentioned mediastinal lymphadenopathy, which I've read can be really serious. Could you help me understand what all this means and what steps we should take next?