At 15 weeks pregnant with twin boys, Meghann Bauer was devastated to learn that the babies' lives were at risk. She was diagnosed with twin-to-twin transfusion syndrome, a circulation imbalance that can occur when twins share the same placenta, in which one twin receives too much blood and the other too little. Bauer's doctor reassured her that there were treatments available and that the best place to go was UCSF.