Fig. 1.

A diagram of fetoscopic laser photocoagulation surgery for twin-to-twin transfusion syndrome by Luks [5]. Pictured are twin fetuses, each within their own amniotic sac. The fetuses have a single shared placenta, with problematic vascular connections that allow a net flow of blood from the donor fetus (lower left) to the recipient fetus (upper right). An endoscope (center) is used to inspect the placental vasculature and find problematic connections. When such connections are found, they are cauterized with a laser (bottom)