The scope has a camera at the end. They can move it around in all direction to get a good view. They see the airways and at least the top of the esophagus. They may be able to go deaper in but I'm not sure. Ask to be able to see the screen and for some xylocane.

6-05, Left Tonsil-T1N2bM0 stageIVA, chemo(Cisplatin), radiation(6660cGy), neck disection, no PEG. HPV negative. (Doc suspects posit)
3-9-09 last of 30 HBO treatments.