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Introduction
The widespread use of high-resolution ultrasound (US) in routine obstetric care has led to greater detection of placental and umbilical cord abnormalities. Cysts of the umbilical cord have been reported in all trimesters. The clinical significance and prognosis of cord cysts vary depending on the gestational age at diagnosis, persistence of the cyst, and associated structural or chromosomal abnormalities.
Disorder
Definition
A cord cyst is defined as an echolucent area within the umbilical cord.
Prevalence and Epidemiology
First-trimester umbilical cord cysts have been reported to occur in approximately 0.4% to 3.4% of pregnancies. Most cysts (approximately 80%) that are diagnosed in early pregnancy resolve by 12 to 14 weeks' gestation and are not associated with an adverse pregnancy outcome. Umbilical cord cysts that persist into the second and third trimester of pregnancy, however, are associated with an increased risk of fetal aneuploidy or fetal structural defects.
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