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Allantoic cysts and posterior urethral valves: a case report
1Division of Urology, Centre Hospitalier Universitaire de Québec (CHUQ), Université Laval, Quebec City, Canada.
Summary
Allantoic cysts detected antenatally may indicate posterior urethral valves (PUV), a urinary obstruction. Early identification and characterization of these umbilical cord cysts are crucial for diagnosis and management.
Area of Science:
- Fetal Medicine
- Urology
- Medical Imaging
Background:
- Allantoic cysts are rare umbilical cord findings, often difficult to differentiate from pseudocysts with poor prognoses.
- The etiology of allantoic cysts is unclear, with obstructive uropathies suggested as a potential cause.
Observation:
- A case of antenatal detection of allantoic cysts and a patent urachus associated with posterior urethral valves (PUV) is reported.
- Cysts observed in the second trimester resolved by 29 weeks, with regular fetal bladder emptying thereafter.
- Fetal kidneys remained normal throughout pregnancy, despite the initial urinary tract obstruction.
Findings:
- The study hypothesizes that increased urinary tract pressure due to PUV maintained urachus patency and formed allantoic cysts.
- It is suggested that cyst perforation allowed fetal bladder decompression, preventing typical PUV complications.
- This case highlights the link between umbilical cord cysts and obstructive uropathies.
Implications:
- Emphasizes the importance of antenatal ultrasound for detecting and characterizing umbilical cord cysts.
- Suggests including obstructive uropathies in the differential diagnosis for umbilical cord cysts communicating with the fetal bladder.
- Underscores the need for thorough evaluation of fetal urinary tract anomalies when allantoic cysts are identified.
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