Surgeons successfully performed a testicle transplant. The procedure could help trans men one day.

Source: https://commons.wikimedia.org

A 36-year-old cis man born without testicles in Belgrade, Serbia has just received a testicular transplant from his identical twin brother to help his body produce its own testosterone and sperm.

It’s only the third such surgery ever to occur in the world, and doctors say it could eventually be applied to trans men using the removed testicles of trans women, but ethical and legal concerns could complicate the matter.

Related: Ibuprofen has a negative impact on men’ testicles according to new study

The surgery was a success, though it wasn’t easy. It involved “sewing together two arteries and two veins that were less than 2 millimeters wide” within two to four hours before the organ became non-viable, according to The New York Times. Both brothers are doing well, they both now have one testicle each and the recipient’s testosterone levels are already at normal levels.

Because the men both have the same genetic makeup, there’s no need for the immune-suppressing drugs that most transplant recipients require to avoid having their bodies reject foreign tissue.

The brothers contacted lead surgeon Dr. Miroslav Djordjevic about the procedure after they’d heard….

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