title: Unusual fate of vesicoallantoic cyst with non-visualization of fetal urinary bladder in a case of patent urachus.
abstract: We present the sonographic findings of a fetus with a vesicoallantoic cyst. The cyst was first identified at 17 weeks of gestation; it was associated with an omphalocele, and disappeared spontaneously at 29 weeks. The fetal urinary bladder was not visualized thereafter. An omphalocele and exstrophia of the urachus were found at birth and repaired. Non-visualization of the fetal urinary bladder suggested rupture of the covering membrane of the omphalocele and allantois during fetal life. A defect in the wall of the omphalocele supported our hypothesis.
authors.affiliation: Department of Ultrasound, Samsung Cheil Hospital, Seoul, Korea.
authors.forename: S J
authors.initials: SJ
authors.lastname: Yoo
authors.forename: Y H
authors.initials: YH
authors.lastname: Lee
authors.forename: H M
authors.initials: HM
authors.lastname: Ryu
authors.forename: M S
authors.initials: MS
authors.lastname: Joo
authors.forename: C K
authors.initials: CK
authors.lastname: Cheon
authors.forename: K W
authors.initials: KW
authors.lastname: Park
mesh_terms: D000328:Adult; D000482:Allantois / Q000000981:diagnostic imaging*; D003560:Cysts / Q000150:complications / Q000000981:diagnostic imaging*; D005260:Female; D005865:Gestational Age; D006554:Hernia, Umbilical / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D012075:Remission, Spontaneous; D016216:Ultrasonography, Prenatal; D014497:Urachus / Q000002:abnormalities* / Q000000981:diagnostic imaging; D001743:Urinary Bladder / Q000000981:diagnostic imaging* / Q000196:embryology