Lesley,
I think it is pretty much the norm that a newly involved doctor wants to use his own lab to verify pathology. We ended up going for a second opinion from a different ENT and he insisted on having the original slides to send to his lab. And this new lab found something the prior lab had missed (extracapsular spread) which totally changed the treatment plan.

I'm a big believer in "gut feelings". If only for your own peace of mind, maybe you ought to look into that second opinion.

Best,
Anita