Fetal Endoscopic Tracheal Occlusion (FETO) in Severe Left Congenital Diaphragmatic Hernia (CDH) NCT3138863

Inclusion Criteria: * Singleton pregnancy * Normal fetal karyotype with confirmation by culture results. Results by fluorescence in situ hybridization (FISH) will be acceptable if the patient is \> 26 weeks. * Isolated Left CDH with liver up * Gestation age at enrollment prior to 29 wks plus 6 days severe pulmonary hypoplasia with ultrasound (US) O/E lung area to head circumference ratio (LHR) \< 25% (measured at 180 to 296 weeks) at the time of surgery; O/E LHR 25% to \<30% (measured at 300 to 316 weeks) at time of surgery. * Gestational age at FETO procedure with O/E LHR \<25% at 27 weeks 0…