Fetal congenital high Airway obstruction syndrome or CHAOS in a 20 week old foetus the fetal lungs appear edematous
With the resultant swelling of the lungs and compression of the fetal diaphragm pushing it downwards and also compression of the fetal heart causing it to appear tubular. In addition there is fetal Ascites and edema of the fetal scalp.
Fetal trachea also appears fluid distended due to high obstruction.
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