Fetal Endoscopic Tracheal Occlusion (FETO) Trial for Congenital Diaphragmatic Hernia (CDH)

This is a single site, single arm, non-randomized, pilot trial to assess the feasibility and safety of treating severe congenital diaphragmatic hernia (CDH) with Fetal Endoscopic Tracheal Occlusion (FETO) at Columbia University Irving Medical Center (CUIMC)/ NewYork-Presbyterian Hospital (NYP).

Inclusion Criteria: 1. Provision of signed and dated informed consent form 2. Stated willingness to comply with all study procedures and availability (meets psychosocial criteria below) for the duration of the study 3. Pregnant women, age 18 years and older 4. Singleton pregnancy 5. No pathogenic variants on microarray or pathologic findings on karyotype; results by fluorescence in situ hybridization (FISH) will be acceptable if patient is \>26 weeks 6. Fetal echocardiogram with changes expected with CDH and no major structural cardiac defects 7. Fetal CDH (left or right) with severe pulmonary hypoplasia, defined as o/e LHR \