Canis ISSN: 2398-2942

Persistent urachus

Contributor(s): Lori Ludwig, Phil Nicholls

Introduction

  • Urachus is the conduit from bladder to alloantoic sac in embryo.
  • Cause: embryological anomaly - failure of urachal stenosis to close off bladder (from allantoic cavity) and form umbilical ligament of bladder.
  • Seen in neonate.
  • Signs: urine drains from umbilicus and bladder may not be completely emptied.
  • Urinary infection common.
  • Related conditions: bladder diverticula Bladder: diverticulum /urachal cysts.
  • Diagnosis: radiography.
  • Treatment: surgery.

Pathogenesis

Pathophysiology

  • Embryological anomaly: failure of urachal stenosis to close off bladder (from allantoic cavity) and form ventral umbilical ligament of bladder.
  • Urachus normally closes at birth, if it remains patent → urine collects in bladder and discharges at umbilicus.
  • May be incomplete closure → diverticulum.

Timecourse

  • Usually noticed within days or weeks of birth.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers


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