The urachus connects the dome of the bladder to the umbilicus duct during fetal life. The urachus is located behind the abdominal wall and anterior to the peritoneum in the space of Retzius. Before birth, the urachus is obliterated and becomes a vestigial structure known as the medial umbilical ligament. In the absence of complete obliteration, the urachus persists as either a patent urachus,<unk>  cyst,<unk>  sinus, or<unk>  diverticulum.
Urachal anomalies
Micrognathism
Cleft lip and palate
Anodontia
Acephaly 
Microcephaly
Anorectal anomalies
Hypodontia