Hope that helps. The older the rat gets, the less they should undergo surgery...too many risks if they're old. So if you're going to send your ratty in, make sure the vet has worked on rats before (very important) and that your ratty is under 1 and 1/2 yrs to stay on the safe side.
Not all tumours are malicious, so if its benign, it might be better for him/her to live with it.
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