What Causes Nodules On Lungs Post Kidney Removal Due To Carcinoma?

MY HUSBAND RECENTLY HAD A KIDNEY REMOVED DUE TO RENAL CELL CARCINOMA NOW HE HAS NODULES ON HIS LUNGS FOLLOWING AN EPISODE OF SEVERAL CLOTS IN HIS LUNGS. THE CANCER HAS WENT TO HIS LUNGS HASN'T IT?
oh ofcourse the all mighty dollar stops me from getting a reply thanks alot for nothing