Congenital High Airway Obstruction Syndrome (CHAOS) is a very rare congenital disorder with partial or complete laryngeal or tracheal atresia. Prenatal diagnosis is important as immediate post-natal intervention only can improve survival from this otherwise fatal disorder. Ultrasonography is primary imaging modality for its diagnosis, which can be supplemented by MRI by identifying level of obstruction and ruling out extrinsic compression to trachea or larynx. We present a case of 28 years old woman presented for routine anomaly scan at 18-19 weeks with fetal ultrasound features of CHAOS.