Presentation
Routine prenatal ultrasound examination to assess fetal growth and anatomy.
Patient Data
A single fetus is present in the variable lie.
The brain, cerebellum, and cisterna magna are normal. The chest is normal in structure and echo pattern, with an intact diaphragm. The heart has four normal chambers and atrioventricular valves.
The anterior abdominal wall shows a large defect. Within the defect, abdominal contents are visualized herniating into a sac covered by a membrane. There is an anechoic collection adjacent to the herniated sac which is suggestive of an allantoic cyst. There is no sign of abdominal rupture or exposure to amniotic fluid.
The spine has a regular outline from the neck to the sacrum, with continuous skin covering.
Each extremity has three long bones. Hands and feet are visible.
The amniotic fluid was normal in amount.
The placenta is posterior and not low-lying.
The uterine artery exhibits normal forward flow with a pulsatility index of 0.78.
Case Discussion
Omphalocele is a congenital abdominal wall abnormality in which abdominal contents protrude via an opening at the base of the umbilical cord. It happens when the abdominal wall fails to close completely during embryonic development, causing abdominal organs to herniate into the base of the umbilical cord. An omphalocele can be accompanied by an allantoic cyst, which is a cystic dilatation of the allantois, a primitive embryonic tissue involved in fetal urinary development.
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