Congenital Abnormality
allantoic cyst
al·lan·to·ic cyst
Definitions related to allantoic cyst:
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A swelling formed at the base of umbilicus associated with a patent urachus which results from an allantoic remnant. The urachus is a fibrous remnant of the allantois which communicates from the apex of the urinary bladder to the umbilicus. Failed obliteration of the urachus can lead to various abnormalities: urachal cyst, urachal diverticulum, sinus or patent urachus - the most common type. Allantoic cysts in infants with patent urachus can be formed due to the drainage of urine into the umbilical cord, or in uncommon situations, after leakage of hypo-osmotic urine into the Wharton's jelly.Human Phenotype Ontology (HPO)The Human Phenotype Ontology Project, 2021
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An umbilical cyst that arises from allantoic tissue that did not regress during gestational development. Most cases involve a patent urachus that allows for communication to the urinary bladder.NCI ThesaurusU.S. National Cancer Institute, 2021
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