SINGLE UMBILICAL ARTERY
- Normally there are two umbilical arteries and one umbilical vein
- Single umbilical artery can result from either agenesis or atrophy
- Occurs in about 1%
of singleton pregnancies and 5% of twin pregnancies
common in women with diabetes and women of European ancestry.
- Can be
associated with trisomy 18, trisomy 13, Turner syndrome and triploidy.
two umbilical arteries are often fused close to the placenta, so examination
of the cord after delivery may result in overdiagnosis of simgle umbilical
of cases have other anomalies (usually cardiovascular, gastrointestinal, or
renal) so should do fetal ultrasound for organ survey if discovered
prenatally; also consider amniocentesis or chorionic villus sampling for
may be an association with intrauterine growth retardation
(Sources include Core Content Review of Family Medicine, 2012)