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Persistent right umbilical vein: incidence and significance
1The Ultrasound Unit, Department of Obstetrics and Gynecology, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center and The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
Summary
The incidence of persistent right umbilical vein is 1:526 in low-risk pregnancies. This condition, when isolated, generally has a favorable neonatal outcome, necessitating targeted fetal sonography and echocardiography for diagnosis.
Area of Science:
- Perinatology
- Fetal Medicine
- Medical Imaging
Background:
- Persistent right umbilical vein (PRUV) was historically considered rare with a poor prognosis.
- Recent evidence suggested a need to re-evaluate PRUV incidence and outcomes.
Purpose of the Study:
- To prospectively evaluate the incidence of PRUV in a low-risk population.
- To assess the neonatal outcomes associated with PRUV.
Main Methods:
- Prospective evaluation of 8950 low-risk patients across two medical centers (August 1995 - November 1998).
- Sonographic diagnosis of PRUV based on specific fetal abdominal transverse section criteria.
Main Results:
- PRUV was detected in 17 fetuses (incidence 1:526).
- Four fetuses had associated malformations; three were detected antenatally.
Conclusions:
- The incidence of PRUV in low-risk populations is higher than previously thought.
- PRUV diagnosis warrants targeted fetal sonography and echocardiography.
- Isolated PRUV, connected to the portal system, generally has a favorable prognosis.