George:
First of all sorry to hear you have renal cell carcinoma, I too have this affliction and sustained a major surgery with a radical nephrectomy so you are not alone.
There are many things that can cause this cancer and for the kidney to hemmorhage which include Blunt Force Trauma (Mount Sini Hospital, Chicago) 101 page report on this type of injury.
A very severe medication reaction can also cause this abnormality as in my case being diagnosed as such by two specialists.
Consult with the urologist handling your case and request an allery test to see if you are highly allergic to specific medications.
People can survive with 1/2 their lung capacity and on one kidney. There are cancer tests being do develop an anti-body that can be taken from your living cancer and treated in some way that has had positive results. Suggest you contact Hoag Presbyterian Memorial Hospital in Newport Beach, California and request the cancer center information as they may be able to help you.