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Updated: Feb 26, 2026

Transuterine Fetal Tracheal Occlusion Model in Mice
Published on: February 5, 2021
An antenatal diagnosis: Congenital high airway obstruction
S Miital1, A Mittal1, R Singal1
1Department of Radiodiagnosis and Imaging, M.M. Institute of Medical Sciences and Research, Mullana, Haryana, India.
Abstract:
Congenital high airway obstruction (CHAOS) is a rare lethal fetal malformation characterised by obstruction to the fetal upper airway, which can be partial or complete. Antenatal diagnosis of CHAOS is important due to recent management options. Diagnosis is made with secondary changes such as hyperechoic enlarged lungs resulting in mediastinal compression, ascites, hydrops, flattened or everted diaphragms and dilated distal airways. We reported a case of CHAOS, antenatally on ultrasonography (USG) at 20 weeks of gestation.
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