"In this case, the classification of the tumour would not affect the outcome of the case so I did not send any tissue samples for pathological classification."
What a wasted opportunity to identify a tumor in a chameleon. Tumors are rarely reported in chameleons and each report adds to the general knowledge.
I've had vet's refuse to send samples of things like pox viruses, etc even when the sample was requested bybanother vet who was studying it and even when I offered to pay.
Then again, I have had vet's study samples and pursue the answer for years.