Assertion: umbilical cord's allantois | /r/CapableOf | present as a cystic
Facets:
Source sentences:
text: The allantois usually regresses by the 14th week of gestation, but may occasionally persist and present as a cystic mass in the base of the umbilical cord.
text: The allantois usually regresses by 14 menstrual weeks, but may occasionally persist and present as a cystic mass in the base of the umbilical cord (2).