Allantoic cyst

Last revised by Yuranga Weerakkody on 1 Jun 2021

Citation, DOI, disclosures and article data

Citation:

Radswiki T, Weerakkody Y, Elfeky M, et al. Allantoic cyst. Reference article, Radiopaedia.org (Accessed on 25 Apr 2024) https://doi.org/10.53347/rID-14713

DOI:

https://doi.org/10.53347/rID-14713

Permalink:

https://radiopaedia.org/articles/14713

rID:

14713

Article created:

24 Aug 2011, The Radswiki ◉

Disclosures:

At the time the article was created The Radswiki had no recorded disclosures.

View The Radswiki's current disclosures

Last revised:

1 Jun 2021, Yuranga Weerakkody ◉

Disclosures:

At the time the article was last revised Yuranga Weerakkody had no recorded disclosures.

View Yuranga Weerakkody's current disclosures

Revisions:

5 times, by 5 contributors - see full revision history and disclosures

Systems:

Obstetrics

Tags:

cases

Synonyms:

Allantoic cysts
Allantoic duct cyst
Allantoic duct cysts

Allantoic cysts are a type of true cyst of the umbilical cord.

The allantois forms from the part of the fetal yolk sac that eventually becomes the primitive hindgut (the cloaca). The cloaca divides into the hindgut posteriorly and the urogenital sinus anteriorly. The allantois remains connected to the urogenital sinus and extends into the base of the umbilical cord. The umbilical cord is formed from the fusion of the body stalk (containing the allantois) and the umbilical vessels and yolk stalk (containing the omphalomesenteric duct). The allantois usually regresses by the 14^th week of gestation, but may occasionally persist and present as a cystic mass in the base of the umbilical cord.

Variants

vesico-allantoic cyst: communicates with the bladder

Radiographic features

Antenatal ultrasound

May be seen as an anechoic cystic mass of the umbilical cord which is centrally located in the cord with the umbilical vessels located against the outer wall. It is typically located at the fetal end of the umbilical cord.