Lesley,
My experience when getting a second opinion was that the doctor providing the second opinion wanted his hospital's pathology lab to review the original slides. In my case, the second opinion was that my margins were not clean and thus needed additional treatment (radiation).

I've heard a number of stories from all sorts of cancer patients who say that the second opinion wsas different from the first, sometimes better, sometimes worse. My conclusion is that this type of pathological assessment is not a black and white decision, but rather requires a lot of experience, interpretation and possibly, intuition.

I think it will be helpful to have your ENT sent the slides to another lab for second reading. - Sheldon