There is no 'leg' as I have called it. The leg turns out to be the spot that is smaller than a pea, and the other spot that the doctor doesn't think is cancer is smaller yet. He had to leave the 'pea' spot because taking it would have messed up some of Tony's abilities.
So the doctor believes he has it down to one spot about the size of half a pea. Now it is up to chemo.