I’ve heard of another. My most recent ex-girlfriend is a urologist, and she told me this story which was told to her by a colleague who is a pediatric urologist (yes, they really specialize!). She didn’t name any names so I figure I can share it.
An infant boy was brought to my ex’s colleague with an undescended testicle. Whatever standard procedures are used to make testicles descend didn’t work in this case, so the doctor simply removed it so it wouldn’t become necrotic or cause other complications. After all, he had another one.
Twelve years later, the boy was brought back to the doctor after an injury which [wince]destroyed the remaining testicle[/wince]. Just in time for puberty! The father was distraught, and asked if a transplant would be possible.
“Well, no,” was the answer. It seems testicles (for whatever reason) are among the most immunogenic organs known to man (pun intended), so the donor would pretty much have to be an identical twin for it to be feasible.
The father brightened at this. “Can do!”
It turned out the boy was an identical twin! So his brother made a donation to the cause (after all, he had another one), and the boy’s teenage hormone angst party continued as scheduled.
I realize this doesn’t answer the OP, but it’s a great story, isn’t it? I’ve got seven months’ worth of stories like that.