A belated Welcome
as you know us, but we don't really know you!
Do you have PKD along with your Lupus? My sister-in-law had to have her huge PKD kidneys removed after being in an automobile accident which caused them to bleed excessively. She actually got pretty sick every time a large cyst ruptured.
But of course, that meant more fluid build up. Are you still urinating? If so, I certainly understand your reluctance to have BOTH kidneys removed. On the other hand, if the kidneys are quite enlarged from the cysts, and you aren't urinating you might find that you are far more comfortable with them gone. It is hard to know without more information.
Anyway, I'm glad you de-lurked!
Aleta