title: The sonographic diagnosis of circumvallate placenta.
abstract: Circumvallate placenta, a form of placenta extrachorialis, should be included in the differential diagnosis of vaginal bleeding in the second trimester with a normally implanted placenta. Heretofore, the diagnosis was made after delivery. This report presents a case of circumvallate placenta diagnosed prenatally by ultrasound. Key features included an infolding of the fetal membrane upon the fetal surface of the placenta during the middle of the second trimester. By the third trimester, only a bright border at the periphery of the placenta was noted. Antenatal diagnosis can be made and pregnancy outcome potentially altered.
authors.affiliation: Department of Obstetrics and Gynecology, Louisiana State University School of Medicine, New Orleans.
authors.forename: M
authors.initials: M
authors.lastname: Bey
authors.forename: A
authors.initials: A
authors.lastname: Dott
authors.forename: J M
authors.initials: JM
authors.lastname: Miller
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007751:Labor, Induced; D010922:Placenta Diseases / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D016216:Ultrasonography, Prenatal; D014592:Uterine Hemorrhage / Q000150:complications