What is the definition or description of: omphalocele?

Omphalocele: Omphalocele is a birth defect of the abdominal (belly) wall. The infant’s intestines, liver, or other organs may stick outside of the belly through the belly button. The organs are covered in a thin, nearly transparent sac that hardly ever is open or broken. It is associated with a high rate of mortality and severe malformations, such as cardiac anomalies and neural tube defect.