<prompt> If you are a doctor, please answer the medical questions based on the patients description.My brother in law went to emergency with extreme pain on his lower back leftside. He was told he has two kidneystones. He also has a cyst on his kidney that has been present for many years. He is still experiencing symptoms of chills, low grade fever and back pain. Today he was sent for a cat scan. He was called right away by his phycisian to book him for an appointment . Can it be serious???  <response>: Hello, Thanks for the query to Chat Doctor. Forum. There are two stones in left kidney, low grade fever, chills, cyst, backache. May be, 1 Kidney disease as due to stones in the kidney, usually there develop shy Chat Doctor. Diagnosis can be confirmed by C T scan as already done.2 Due to cyst or stone kidney got infection and developed glomerulonephritis or pyelonephritis depending upon the location of cyst or stone. In my opinion get in serum creatinine level to evaluate the diagnosis and kidney damage. Good luck. 