Adenomas are benign Lisa. Barnaby my Many Tears rescue aged approx 9 years, has had 3 operations in the nearly 2 years I've had him, to have around 18 of these growths removed when they've become big enough to be troublesome. He's got more again now and I will be seeing about removal of some more soon.
He's been fine after all the surgery and recovered really well with no problems. Your vet will not operate if he is not otherwise healthy enough to withstand the anaesthetic..
They've been referred to as warts but my vet says they are adenomas.
I would not be happy that I had not been given enough clear information by my vet . I think I would be going round to the surgery to ask to see them in person, could you do this?
Take care try not to worry
Jann