Surgeons in southern California successfully completed the world's first-ever human bladder transplant on 41-year-old Oscar Larrainzar in what's being called a potentially "game-changing" method

In an eight-hour procedure at Ronald Reagan UCLA Medical Center, surgeons from UCLA Health and Keck Medicine of USC performed the world’s first-ever human bladder transplant, marking a watershed moment in transplantation medicine that could eventually help millions suffering from severe bladder conditions.