Severe Congenital Diaphragmatic Hernia

The purpose of this pilot study is to evaluate the feasibility of using Fetoscopic Endoluminal Tracheal Occlusion (FETO) in 10 pregnant individuals carrying fetuses with severe congenital diaphragmatic hernia (CDH). FETO surgery will be performed at 27 weeks - 29 weeks and 6 days of gestation, and the fetoscopic removal of the balloon will be performed at 34 weeks - 34 weeks and 6 days of gestation. The primary endpoint is successful placement and removal of the balloon.