Circumvallate placenta

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Circumvallate placenta
Classification and external resources
ICD-10 O43.1
DiseasesDB 2726

Circumvallate placenta is a placental disease in which the fetal membranes (chorion and amnion) "double back" on the fetal side around the edge of the placenta.[1] After delivery, a circumvallate placenta has a thick ring of membranes on its fetal surface.[2]

Complete circumvallate placenta occurs in approximately 1% of pregnancies.[1] It is diagnosed prenatally by medical ultrasonography, although one 1997 study of prenatal ultrasounds found that "of the normal placentas, 35% were graded as probably or definitely circumvallate by at least one sonologist," and "all sonologists misgraded the case of complete circumvallation as normal."[1] The condition is associated with perinatal complications such as placental abruption, oligohydramnios, abnormal cardiotocography, preterm birth, and miscarriage.[3]


  1. ^ a b c Harris, Robert D; Wells, Wendy A; Black, William C; Chertoff, Jocelyn D; Poplack, Steven P; Sargent, Steven K; Crow, Harte C (1997). "Accuracy of Prenatal Sonography for Detecting Circumvallate Placenta". American Journal of Roentgenology 168 (6): 1603–8. doi:10.2214/ajr.168.6.9168736. PMID 9168736. 
  2. ^ Yetter, Joseph F (1998). "Examination of the Placenta". American Family Physician 57 (5): 1045–54. PMID 9518951. 
  3. ^ Suzuki, Shunji (2007). "Clinical significance of pregnancies with circumvallate placenta". Journal of Obstetrics and Gynaecology Research 34 (1): 51–4. doi:10.1111/j.1447-0756.2007.00682.x. PMID 18226129.