Prenatal Detection of Vesico-Allantoic Cyst: Ultrasound and Autopsy Findings.

Introduction: The vesico-allantoic cyst is a communication between the fetal bladder and the allantois through a patent urachus.Case Report: We describe a 17-week of gestational age (WGA) fetus with a 40 x 30 mm vesico-allantoic cyst. At 19 WGA, ultrasound (US) detected bilateral dilatation of renal pelvis (5-6 mm), hydroureters, and hypospadias. Amniotic fluid, umbilical cord flow, and fetal biometry were regular. Due to uncertain prognosis, the parents opted for legal termination of pregnancy. Autopsy confirmed the prenatal findings, also revealing intestinal malrotation and Meckel's diverticulum.Discussion/Conclusion: Probably an initial urinary tract obstruction occurred, not yet affecting the amniotic fluid volume, but evident as pyelectasis. This case highlights the possibility that genito-urinary and intestinal anomalies may be found in association with the vesico-allantoic cyst.

[1]  J. Schanstra,et al.  Definition, diagnosis and management of fetal lower urinary tract obstruction: consensus of the ERKNet CAKUT-Obstructive Uropathy Work Group , 2022, Nature Reviews Urology.

[2]  A. Ciobanu,et al.  A Rare Case of Allantoic Cyst with Patent Urachus in Fetus with a Microdeletion in 1q21.1q21.2 Region , 2021, Diagnostics.

[3]  T. Levin,et al.  Bladder prolapse through a patent urachus presenting as an umbilical mass in the newborn: characteristic prenatal sonographic findings and the diagnostic benefit of postnatal cystography , 2021, Pediatric Radiology.

[4]  G. Falke,et al.  Congenital Bladder Prolapse through a Patent Urachus: Two Institutions' Experience. , 2021, Urology.

[5]  I. Tekesin,et al.  Prenatal Diagnosis and Clinical Course of a Patent Urachus Associated with an Allantoic Cord Cyst and a Giant Umbilical Cord , 2018, Ultrasound International Open.

[6]  D. Barrieras,et al.  Prenatal vesico‐allantoic cyst outcome – a spectrum from patent urachus to bladder exstrophy , 2015, Prenatal diagnosis.

[7]  W. Choi,et al.  Pseudoexstrophy of the bladder diagnosed prenatally , 2013, Prenatal diagnosis.

[8]  A. Matias,et al.  Bladder emptying into an umbilical cord cyst: prenatal sonographic sign of allantoic cyst with patent urachus , 2013, Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

[9]  S. Bolduc,et al.  Allantoic cysts and posterior urethral valves: a case report , 2011, Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

[10]  F. Sampaio,et al.  Structural and Ontogenetic Study of the Urachus in Human Fetuses , 2009, Cells Tissues Organs.

[11]  K. Pal,et al.  Allantoic cyst and patent urachus , 2009, Indian Journal of Pediatrics.

[12]  C. Thorns,et al.  Prenatal management of an allantoic cyst with patent urachus , 2009, Archives of Gynecology and Obstetrics.

[13]  R. Frydman,et al.  Prenatal Diagnosis of a Patent Urachus Cyst with the Use of 2D, 3D, 4D Ultrasound and Fetal Magnetic Resonance Imaging , 2008, Fetal Diagnosis and Therapy.

[14]  Ji-Eun Lee,et al.  Umbilical cord cyst: a prenatal clue to bladder exstrophy , 2007, Prenatal diagnosis.

[15]  F. Matsui,et al.  Prenatally diagnosed patent urachus with bladder prolapse. , 2007, Journal of pediatric surgery.

[16]  S. Emil,et al.  Bladder prolapse through a patent urachus: fetal and neonatal features. , 2006, Journal of pediatric surgery.

[17]  E. Tarım,et al.  Large pseudocyst of the umbilical cord associated with patent urachus , 2004, The journal of obstetrics and gynaecology research.

[18]  H. Heij,et al.  Prenatally diagnosed ruptured vesico-allantoic cyst presenting as patent urachus at birth. , 2003, The Journal of urology.

[19]  Y. Kanamori,et al.  A Case of Fetal Vesicoallantoic Cyst in the Umbilical Cord , 2003, Fetal Diagnosis and Therapy.

[20]  J. Jona.  Allantoic cyst and persistent urachal-allantoic communication: a rare umbilical anomaly. , 1998, Journal of pediatric surgery.

[21]  J. Maher,et al.  Persistent patent urachus with allantoic cyst: a case report , 1997, Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

[22]  S. Yoo,et al.  Unusual fate of vesicoallantoic cyst with non‐visualization of fetal urinary bladder in a case of patent urachus , 1997, Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

[23]  W. Sepulveda,et al.  Prenatal diagnosis of congenital patent urachus and allantoic cyst: the value of color flow imaging. , 1995, Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

[24]  J. Guerrieri,et al.  The detection of a patent urachus and allantoic cyst of the umbilical cord on prenatal ultrasonography , 1992, Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

[25]  W. Persutte,et al.  Disappearing fetal umbilical cord masses. Are these findings suggestive of urachal anomalies? , 1990, Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

[26]  W. Persutte,et al.  Antenatal diagnosis of fetal patent urachus. , 1988, Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine.

[27]  J. Fourcroy,et al.  Prenatal detection of umbilical cord allantoic cyst. , 1982, Radiology.

[28]  V. Lane.  Congenital patent urachus associated with complete (hypospadiac( duplication of the urethra and solitary crossed renal ectopia. , 1982, The Journal of urology.