KEY POINTS Print Section Listen Key Points Third most common liveborn autosomal aneuploidy. Incidence is approximately 1 in 5000 livebirths. Sonographic findings include holoprosencephaly, abnormal midface, congenital heart defects, polydactyly,…
KEY POINTS Print Section Listen Key Points Intrauterine growth restriction (IUGR) is commonly defined as a birth weight less than the 10th percentile at a given gestational age. It has…
KEY POINTS Print Section Listen Key Points Immune hydrops is a serious condition in which abnormal fluid collections accumulate in at least two different fetal compartments, and in which circulating…
KEY POINTS Print Section Listen Key Points The twin-to-twin transfusion syndrome (TTTS) is a complication of monochorionic multiple gestations resulting from vascular communications in the placenta (chorangiopagus), such that one…
KEY POINTS Print Section Listen Key Points Conjoined twins are rare, and they may be joined at a variety of sites. The nomenclature in use to describe conjoined twins is…
KEY POINTS Print Section Listen Key Points Congenital malformations occur more commonly in twins as compared with singleton gestations and are an important contributor to the increased perinatal mortality associated…
KEY POINTS Print Section Listen Key Points Group of conditions characterized by generalized excessive growth for gestational age. Incidence between 1 in 10,000 and 1 in 15,000. Sonographic findings include…
KEY POINTS Print Section Listen Key Points Oligohydramnios is a decrease in the volume of amniotic fluid, with the diagnosis usually being made using ultrasound. Causes of oligohydramnios include ruptured…
KEY POINTS Print Section Listen Key Points Twin reversed arterial perfusion (TRAP) sequence, also known as acardia, is a rare anomaly unique to multiple gestation in which one twin has…
KEY POINTS Print Section Listen Key Points Intrauterine fetal death (IUFD) of one twin in the first trimester is common and is known as a “vanishing twin.” Although a “vanishing…
