Congenital diaphragmatic hernia
Routine antenatal ultrasound.
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Ultrasound reveals herniation of the stomach bubble into the left hemithorax causing mild displacement of the heart.
A congenital diaphragmatic hernia (most commonly Bochdalek type) is most often seen on the left side, as seen in this case. This occurs due to a defect in development of the diaphragm. The herniated bowel loops cause impairment in the development of the lungs, which is the major factor responsible for the morbidity and mortality of these fetuses. Polyhydramnios may also be seen due to compression of the esophagus.