Allantoic cyst associated with obstructive uropathy
a case report with spontaneous prenatal regression
DOI:
https://doi.org/10.29327/218041.32.37-6Keywords:
cysts, umbilical cord, prenatal diagnosis, ultrasound, spontaneous remissionAbstract
INTRODUCTION: The allantoic cyst is a dilation that occurs due to inadequate regression and closure of the urachus. Our objective was to describe the prenatal findings of a fetus presenting with an allantoic cyst and evidence of obstructive uropathy that progressed with spontaneous regression still in the second trimester. CASE REPORT: The patient was a 17-year-old pregnant woman whose obstetric ultrasound at 16 weeks revealed a cord cyst measuring 2.3 cm in diameter, communicating with a dilated fetal bladder. The "keyhole sign" was observed, indicating possible urethral obstruction. One month later, dilation of both renal pelvises was also noted. At 24 weeks, the cyst was no longer visible, and the bladder dimensions were normal, which also occurred with the renal pelvises by 35 weeks. The child was born asymptomatic, with no persistence of the urachus. DISCUSSION: There is a hypothesis that allantoic cysts may form due to increased pressure in the urinary tract caused by an obstruction, as seemingly observed in our case. It is noteworthy that both cases exhibited spontaneous and early involution compared to descriptions in the literature, possibly due to cyst rupture or resolution of the cause of the obstruction. CONCLUSION: The diagnosis and description of the evolution of allantoic cysts during pregnancy are rare. They tend to exhibit spontaneous involution, but not as early as in our case, which may have occurred due to cyst rupture or natural resolution of fetal urinary obstruction.
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- 2024-12-02 (2)
- 2024-10-01 (1)
