Laser coagulation of vascular anastomoses of the placenta in twin-to-twin transfusion syndrome is an intrauterine procedure that helps restore proper blood flow between twins so that both fetuses receive adequate nutrition and develop normally. Twin-to-twin transfusion syndrome occurs in twins when unequal blood sharing occurs via abnormal vascular connections in a shared placenta. Through these abnormal vessels, blood flows excessively from one fetus (the donor) to the other (the recipient), leading to severe consequences for both fetuses. As a result, the fetal circulatory systems are separated, and each begins to receive nutrition and oxygen without blood transfer to the other.