<prompt> What is the basis for the formation of Omphalocele?Excessive length of the intestinePhysiological hernia failing to go backHerniation of liverHerniation of umbilicus  <response>: Omphalocele is protrusion of abdominal contents through the umbilical ring. It is due to failure of physiological hernia to reduce into the abdominal cavity , which results in non-closure of the umbilical ring. An Omphalocele may contain stomach, liver and intestines. And these contents are enclosed in a sac. Omphalocele is usually associated with other congenital anolamies Eg; trisomy 13, trisomy 18, or Beckwith- Widemann syndrome and with increased levels of a-fetoprotein. Ref: Gray;s Anatomy 41st edition Pgno: 1081 