Urachus

The urachus (plural: urachuses or urachi ) is the fibrous vestigial remnant of the embryonic allantois.

The lumen of the urachus usually obliterates after birth and it becomes known as the median umbilical ligament, which is covered by a midline linear fibrous fold of parietal peritoneum (called the median umbilical fold), which extends from the apex of the bladder to the umbilicus. It is located in the retropubic space.

If the lumen does not completely involute, a spectrum of urachal remnants may persist, including:

• patent urachus
• urachal cyst
• urachal-umbilical sinus
• vesicourachal diverticulum

A urachal remnant may transform into an adenocarcinoma.

Siehe auch:

• Urachuszyste
• persistierender Urachusgang

und weiter:

• Urachusfistel
• umbilical remnant malformations