I've posted before about my rats tumor and I've decided surgery is not an option.(shes very old) But he tumor has necrotic tissue all over the bottom of it and it smells pretty bad. She doesnt act like shes in pain, still eats , not to thin and looks happy as always. What will happen to the necrotic tissue? Is it possible that she will pass away on her own? I don't want to put a happy rat to sleep but I need advice. Do necrotic tumors cause pain?