fetal demise were observed.Preterm premature rupture of the membranes was observed in up to 21/50 (42.0%) cases.Mean GA at birth was 35.6 weeks and overall survival rate was 30% (15/50).Conclusions: Implementing a standardised technique for intrauterine ultrasound-guided balloon puncture is safe and feasible and avoids the need for a second fetoscopy for the reversal of endoscopic tracheal occlusion in most cases.