Fetal Treatment Program of New England

Congenital High Airway Obstruction Syndrome (CHAOS)

Congenital high airway obstruction syndrome (CHAOS) occurs when the fetal airway is blocked, causing swelling of the lungs, trachea and bronchial tubes, as well as heart failure. CHAOS is assessed through amniocentesis, level II ultrasound, fetal echocardiogram and prenatal MRI.

Most cases are best treated after birth, with delivery via EXIT procedure. In severe cases, we may recommend fetal intervention to relieve the blockage.