title: Allantoic cyst - an unusual umbilical cord swelling.
abstract: We report a baby with an unusual umbilical cord swelling. On the antenatal scans, a cystic area within the umbilical cord near its insertion onto the abdominal wall was detected. Postnatally an unusually thick umbilical cord with a yellow fluid filled cyst at the base was noted. The fluid from the cyst was confirmed as urine and ultrasound confirmed patent urachus. The baby underwent a cystoscopy and excision of patent urachus with associated allantoic cyst. Allantoic cyst is a rare swelling formed at the base of umbilicus associated with a patent urachus which results from an allantoic remnant. Paediatricians need to be aware about this condition as investigation is required to differentiate allantois cysts from umbilical pseudocysts. A patent urachus with allantoic cyst requires surgical excision.
authors.affiliation: City Hospital, Birmingham.
authors.forename: N
authors.initials: N
authors.lastname: Gupta
authors.affiliation: Alder Hey, Liverpool.
authors.forename: H
authors.initials: H
authors.lastname: Corbett
authors.affiliation: City Hospital, Birmingham.
authors.forename: R
authors.initials: R
authors.lastname: Ismail
authors.affiliation: City Hospital, Birmingham.
authors.forename: R
authors.initials: R
authors.lastname: Sathanantharajah
authors.affiliation: City Hospital, Birmingham.
authors.forename: S
authors.initials: S
authors.lastname: Sivakumar
authors.affiliation: Birmingham Children's Hospital, Birmingham, UK.
authors.forename: Liam
authors.initials: L
authors.lastname: McCarthy