Congenital high airway obstruction syndrome-antenatal diagnosis of a rare case of airway obstruction using multimodality imaging

摘要

Congenital high airway obstruction syndrome (CHAOS) is a rare condition which occurs as a result of congenital foetal airway obstruction which may be complete or partial. The disease is usually incompatible with life and leads to stillbirth or death shortly after delivery. However, due to advances in antenatal imaging by ultrasound and magnetic resonance imaging (MRI), more cases are being detected in the antenatal period. Commonly, CHAOS occur secondary to atresia or stenosis of the larynx or trachea, which may be partial or complete or due to a laryngeal cyst. We report a case of CHAOS due to laryn-geal atresia diagnosed by antenatal ultrasonography and foetal MRI. We also briefly review the pertinent literature.