Conversation: The conversation between human and AI assistant.
[|Human|] Sir,   My father have back pain and blood in urine He take medicine about 6 months.  The CAT scan shows that mildly enhancing intraluminal lesion noted filling the right distal ureter. The terminal ureter is narrowed, no extension to VU Junction.  Lesion caused complete luminal obliteration with proximal hydronephroureterosis.  Blood products noted in the dilated collecting system NS URETER.  Marked parenchymal thinning of right kidney noted.  The doctors says that we should remove the entire kidney, but he has asthma and he was a cardiac patient. So its very risk to operate.  Then papa not accept it.  If we not done the operation,  what will be the next step?
[|AI|]  Hello and welcome to Chat Doctor. As a Urologist, let me advise you, that surgery for your fathers right ureter is indicated, as the right kidney is blocked. The right kidney is severely affected, with very poor function, as seen on the CT scan. Now cardiac and lung function will be tested, to know the high risk of surgery. Without surgery, if it's a cancerous tumor, till spread towards kidney and bladder.  He may start bleeding in urine severely. You may contact me here for expert opinion, with question directed in my name.  Wishing your father well.