Abstract

Allantoic cysts of the umbilical cord are rare anomalies in which a patent urachus links the bladder to a true cyst of the cord. Characteristic features include location close to the abdominal wall and splaying of the umbilical vessels around the cyst. Communication with the bladder via a patent urachus may be seen. Patent urachus can cause cord edema and pseudocysts. Here, we present serial ultrasound findings in a case of a 3 cm allantoic cyst diagnosed at 21 weeks and followed through pregnancy, with increase to 6 × 3 cm and development of cord edema and pseudocysts at 36 weeks. The neonate was otherwise normal and had an uneventful surgical repair. Allantoic cysts of the cord must be distinguished from omphalocele and cord pseudocysts; allantoic cysts are associated with urinary tract abnormalities but are not strongly linked to aneuploidy. Fetal compromise due to compression of cord vessels by increasing size of an allantoic cyst has been reported. In this pregnancy, antenatal testing remained reassuring despite the changes in cord appearance delivery was uneventful. Pathology confirmed a true cyst and ‘massive edema’ of the cord. Supporting information can be found in the online version of this abstract. Upper row: 2D and 3D images at 21 weeks. The cord cyst was unilocular. Lower row: 36 week scan showing cord edema and multiple pseudocysts. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

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