Q. There is a small hard lump under her tongue the vet took sample and am waiting for results she still eats and drinks but doesn't use litter box
DAVID ELBEZE, DVM, MRCVS
A. Lump under the tongue in cats are usually aggressive tumors, so this is not good news at all. It will eventually interfere with eating to the point where she will stop eating.
Those tumors are usually difficult if not impossible to remove surgically.
Hopefully it's one of those that are not aggressive, wait for the lab results then yo can think and decide what to do.