Chimaeric twins: Why monochorionicity does not guarantee monozygosity

  title={Chimaeric twins: Why monochorionicity does not guarantee monozygosity},
  author={Mark P. Umstad and R. Short and M. Wilson and J. Craig},
  journal={Australian and New Zealand Journal of Obstetrics and Gynaecology},
Monochorionic placentation has been consideredpathognomonic of monozygosity for generations ofobstetricians. This rule has been considered so robust thatalmost all parents of twins with a single placentadiagnosed on first-trimester ultrasound have been advisedthat no further testing is ever required to prove theirtwins’ monozygosity.In recent years, there have been a number of reports ofmonochorionic dizygotic (MCDZ) twins, almostexclusively following treatment with assisted… Expand
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