Abstract
Abstract Objective: The objective of this study was to describe the antenatal ultrasound appearances of congenital high airway obstruction syndrome (CHAOS), which typically manifests as large echogenic lungs acquiring whole of the thorax and dilatation of the trachea distal to the obstruction and causing intrinsic laryngeal/tracheal obstruction. Case report: A 30-year-old pregnant female with 24 weeks gestation come for routine absolute neutrophil count (ANC) scan. Ultrasonography (USG) was performed, and large echogenic lungs occupying whole of the thoracic cavity compressing the heart in between and causing inversion of the bilateral domes of the diaphragm were found. There was dilatation of the tracheal distal to the lesion and polyhydramnios. Conclusion: The described USG finding of CHAOS may be useful in deciding when to include this entity in the differential diagnosis of enlarged echogenic lungs.
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