urachus

Definition: The urachus is a fibrous remnant of the allantois, a canal that drains the urinary bladder of the fetus that joins and runs within the umbilical cord. The fibrous remnant lies in the space of Retzius, between the transversalis fascia anteriorly and the peritoneum posteriorly.

Pathology

 urachal anomalies

• urachal fistula
• urachal sinus
• urachal sinus
• vesical diverticulum (bladder diverticulum )
• congenital patent urachus

 urachal tumors

See also

 vesical malformations