### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I am 66 yrs old, with back pain .  I just had two knee replacements and I had the back pain prior to the surgeries onmy knees.  I had an MRI done and saw a back surgeon today.  He told me I had a small amount of spinal stenosis, but the lab results also show a 9 mm cyst on my kidney.  He is sending me to  a urologist for further examination. I have been a smoker for many years and have stopped in March of this year.  The pain in my back has been there for a while and the pain goes doewn to the crack of my butt .  I have to wear a depend because I cant get to the potty fast enough when I need to urinate. Im scared and Im making an appointment to see a urologist.  Should I prepare myself for cancer?

### output:

Hello and welcome to Chat Doctor, A cyst in the kidney is not necessarily due to a cancer. Smoking is a risk factor for developing cancer however, presence of cancer is not confirmed by presence of a risk factor. Cysts of the kidney are usually benign. Symptomatic cysts are surgically removed and examined histopathologically to look for any evidence of cancer. If it turns out to be benign, no further treatment is required. If it turns out to be malignant, additional chemotherapy may be required. So, consult your urologist and don't worry. The possibility of cancer is low but if present, good treatment modalities are available for its cure. The back pain that you are experiencing is due to the stenosis. You need to consult your neurologist for management of spinal stenosis. Thanks and take care Chat Doctor. 