The grossly abnormal development of the embryo observed in 12 partial hydatidiform moles indicate that, in aborted triploid embryos, the presence of two paternal genomes might have both placental and embryonic consequences. Transcervical embryoscopy in cases of missed abortion can serve as a central component in additional studies using molecular determination of parental origin of triploidy to establish the true proportion of diandric triploidy among grossly abnormal triploid embryos.

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