I'm a kidney recipient, eight years old coming up on nine with successful transplant.
Leave dead kidneys in place. New to body kidney is placed above hip on hollow made in fat and muscle. Blood is connected to femoral systems, ureter from kidney is placed in bladder via surged spot, sewn in, left to heal.
No use in taking dead organs out. No room to place or piggyback new organ in area of old.
So far so good!
kevin,five toed ground sloth,L