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Updated: Feb 14, 2026

Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues
Published on: October 20, 2019
A fetus coexisting with a complete hydatidiform mole with trisomy 9 of maternal origin
Anita Sik Yau Kan1, Elizabeth Tak Kwong Lau2, Chun Hong So3
1Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong, China.
Abstract:
A complete hydatidiform mole (CHM) coexisting with a viable fetus is a rare finding in pregnancies. Accurate diagnosis often relies on ultrasonographic, histopathological and molecular techniques in the definite diagnosis. To the best of our knowledge, a liveborn fetus coexisting with CHM with trisomy 9 has not been described. The use of molecular genotyping and immunohistochemical laboratory investigations enabled the CHM to be fully characterized. Postzygotic diploidization of a triploid conception arising from dispermy is the proposed mechanism of its formation.
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