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Updated: Jun 22, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
Published on: September 5, 2011
Monochorionic dizygotic twins in a spontaneous pregnancy: a rare case report
Rinat Hackmon1, Susan Jormark, Vanessa Cheng
1Department of Obstetrics and Gynecology, Lenox Hill Hospital, NY, NY 10025, USA. rhackmon@fhcrc.org
Abstract:
Traditionally, monochorionicity in multiple pregnancies is associated with monozygocity. We present a case of a spontaneous, monochorionic dizygotic, sex-discordant twin pregnancy. The diagnosis of monochorionicity was initially done during first-trimester ultrasound evaluation and then confirmed by postnatal placental pathology. Furthermore, both twins were found to have blood chimerism. We also review the literature on dizygotic-monochorionic twins and blood-chimerism. We suggest that further prospective postnatal genetic studies are needed to define the reliability of prenatal diagnosis of identical twins in cases of monochorionicity.
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