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"It's extremely rare for additional kidneys to be complete. One in a million is probably about right," says Niaz Ahmad, a transplant surgeon at St James's University Hospital in Leeds. "I've seen thousands of kidneys and I've never seen this."
The condition is caused by a glitch in the first trimester, when the developing kidneys split in two. It is more common for these "duplex kidneys" to split only partially, or to grow a second ureter (the tube that drains urine into the bladder).
Duplex kidneys occur in 1% of the population, the most common complication being infections caused by urine flowing back up to the ureter.
Originally posted by LLoyd45
For 50 large, I'd sell my spare kidney in a heartbeat! You only need one to survive.