OBJECTIVES: To determine the accuracy of antenatal prediction of chorionicity in twin pregnancies in our institution. METHODS: Antenatal chorionicity was determined using the number of placental masses, the presence or absence of a twin peak sign and the fetal sex. The gestational age at assessment was documented. Postnatal diagnosis of chorionicity was determined by neonatal sex and placental pathology. RESULTS: Chorionicity was correctly determined in 95% of cases (n = 131); 91% of the monochorionic and 96% of the dichorionic pregnancies were correctly determined. If chorionicity was assessed prior to 14 weeks' gestation (n = 96) the correct diagnosis was made in all except one case. CONCLUSIONS: Ultrasound assessment of chorionicity has a high sensitivity and specificity. This is further improved if the assessment is performed prior to 14 weeks' gestation.
OBJECTIVES: To determine the accuracy of antenatal prediction of chorionicity in twin pregnancies in our institution. METHODS: Antenatal chorionicity was determined using the number of placental masses, the presence or absence of a twin peak sign and the fetal sex. The gestational age at assessment was documented. Postnatal diagnosis of chorionicity was determined by neonatal sex and placental pathology. RESULTS: Chorionicity was correctly determined in 95% of cases (n = 131); 91% of the monochorionic and 96% of the dichorionic pregnancies were correctly determined. If chorionicity was assessed prior to 14 weeks' gestation (n = 96) the correct diagnosis was made in all except one case. CONCLUSIONS: Ultrasound assessment of chorionicity has a high sensitivity and specificity. This is further improved if the assessment is performed prior to 14 weeks' gestation.
Authors: Yair J Blumenfeld; Valerija Momirova; Dwight J Rouse; Steve N Caritis; Anthony Sciscione; Alan M Peaceman; Uma M Reddy; Michael W Varner; Fergal D Malone; Jay D Iams; Brian M Mercer; John M Thorp; Yoram Sorokin; Marshall W Carpenter; Julie Lo; Susan M Ramin; Margaret Harper Journal: J Ultrasound Med Date: 2014-12 Impact factor: 2.153