First AD

Second AD

What is your diagnosis in this late 2nd trimester fetus?

(Images are courtesy of Firoz Bhuvar, MD)

The correct answer is CHAOS. CHAOS or congenital high airway obstruction syndrome is characterized by laryngeal stenosis or atresia with resultant accumulation of fluid in the distended lungs causing compression of the fetal heart (tubular shaped), ascites and dilated trachea. 

Pregnancy and Birth

QUIZ: What's causing the compression of the fetal heart (tubular shaped), ascites and dilated trachea?

Image IQ: Compression of the Fetal Heart

Joe Antony, MD