I think it would show something. But the ENT more than likely would have. My friend who had throat cancer had his found by the ENT. He had sore throats and a lump in his throat. He lost weight and was very tired but his cancer was advanced. As soon as he went to the ENT, the doctor found the cancer with the scope.They can see alot with it.He had the cat scan & pet scan after which showed the extent of the cancer. He had the lump in his neck for a long time before seeing a doctor because he was afraid.
If you are not happy with this doc, please see someone else for your peace of mind. If it is cancer it can be treated so much easier the earlier it is caught. I hope this helps!