Kidney transplant - necessary

Whether pre-renal transplant patients must take nephrectomy it? The current kidney transplant implanted in the abdominal cavity just completed a healthy kidney procedures have not advocate for pre-transplant kidney removed first, unless it is necessary.
The so-called necessary, which means the original kidney disease continues to exist, it will directly endanger the health of patients, or the further spread of the disease. Such as severe renal tuberculosis, kidney function itself has lost its existence tuberculosis, but also to spread throughout; Another example is the existence of multiple casting stones, associated with persistent bacterial infection, easily lead to sepsis, renal pelvis empyema, perirenal abscesses and other life-threatening complications; addition, kidney tumors, huge polycystic kidney disease, a lot of urine, etc., are also considered as the first nephrectomy recovery after a kidney transplant, not two surgical simultaneously. In addition to the above diseases, renal not handle the original claim.