Welcome to HCM dear. Thanks for the question. I would like to answer your question in two parts 1. Explanation of physical findings on biopsy - You may already know that each kidney contains about a million tiny filters (called nephrons). We all have damage to these filters after the age of 40years due to normal aging process. Some of us have excess damage due to various different conditions (diabetes, high blood pressure, genetic kidney disease, etc) The scarring (this is the term we use to explain to common man) that was seen on your kidney (I suspect it most likely means filters) is the end result of longstanding damage due to any cause. So, the scarring tells us that there is no active disease to treat now. The complex cyst in the kidney may/ maynot be related to the general ongoing slow damage to your kidney and MRI is the right way to assess any complex cyst. 2. Functional status of your kidney - The staging (Chronic Kidney Disease stage 1 to 5) is based on blood test (creatinine and eGFR) and might not tally well with the physical findings of kidneys on scan or biopsy. Your nephrologist will monitor this regularly. Once eGFR goes below 15 we class patients as CKD stage 5. Dialysis or transplant usually become necessary when eGFR goes below 10. Hope the above clarifies your doubts.