This is a difficult problem that I don’t think can be solved with existing technology. That is, it is never a good idea to rely on a doctor’s skill to detect something, because a lot of doctors, like everybody else, just won’t have that skill.
But that being said, I do foresee a possible solution to the problem. Finding something that makes these tissues stand out and be more recognizable. Creating a contrast between it and healthy tissue to make it easier to see.
This could be any number of things, such as swallowing a dye, or having a dye sprayed by the scope, the dye either sticking to, or not sticking to, the suspect tissue.
It could also be done as a chemical or radioactive tag that is more or less absorbed by these tissues.
Again, whatever works.