Twin pregnancies with two separate placental masses can still be monochorionic and have vascular anastomoses

American Journal of Obstetrics and Gynecology
E LoprioreF P H A Vandenbussche

Abstract

This study was undertaken to report the occurrence of bipartite monochorionic twin placentas. Examination of 109 monochorionic placentas delivered at our institution between June 2002 and June 2005 was performed. Placental characteristics on prenatal ultrasound were studied, including single or double appearance and type of intertwin membrane-placental junction ("T" sign or lambda sign). Monochorionicity was confirmed by postnatal histologic confirmation (diamniotic intertwin membrane without chorionic tissue within the dividing septum). Bipartition was diagnosed when 2 separate placental masses attached by membranes were identified. Of the 109 monochorionic placentas, 3 were composed of 2 separate placental masses. Prenatal ultrasound examination showed 2 separate placental masses in each case. Monochorionicity was suspected on prenatal ultrasound because of the presence of "T" sign in 2 cases and twin-to-twin transfusion syndrome (TTTS) in another case. Microscopic examination of the dividing septum was consistent with monochorionicity in each case. Vascular anastomoses were present in 2 of the 3 placentas, and led in both cases to the development of TTTS. Two separate placental masses in twin pregnancies are not per se dicho...Continue Reading

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Citations

Nov 19, 2015·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·A KhalilY Ville
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