Abstract
Congenital high airway obstruction syndrome (CHAOS) is an uncommon malformation. Prenatal diagnosis of this malformation by ultrasound has previously been described. Prenatal identification will allow us to offer patients the possibility of prenatal counseling and to substantially improve perinatal outcomes in comparison with those in fetuses without a prenatal diagnosis, in which emergency maneuvers must be performed with unpredictable results. Currently, most of the cases described in the literature correspond to pregnancies with a prenatal diagnosis, which has allowed cesarean section to be successfully performed with the EXIT procedure (ex utero intrapartum treatment). Excellent results have sometimes been obtained.
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