I am 42 yrs old. I had occasional light pain in left renal region and on USG, hydronephrosis was found in left kidney. After CT scan, it was found malrotated left kidney. Doctors suggested DTPA scan and in DTPA scan left kidney is 15% and Rt Kidney is 85% functional. Now doctor suggests, nephrectomy but also said its not urgency. I want to know its prognosis and further course of action. If I do not go for nephrectomy, then what will happen?