Abstract
Complete hydatidiform mole (CHM) with co-existing fetus (CHMCF) is very uncommon. In this study, we investigated the clinicopathological features and DNA genotype in 15 CHMCF. Seven patients (46.7%) developed post-molar gestational trophoblastic disease (GTD), 5 of which had lung metastasis. CHMCF was histologically characterized by a mixed pattern of CHM and the non-molar placenta, mimicking partial hydatidiform mole and placental mesenchymal dysplasia. p57 immunostaining showed a divergent staining pattern, positive in the normal placenta and negative in the CHM component. DNA genotyping of the CHM villi demonstrated exclusively paternal alleles consisting of homozygous/monospermic (n=9) and heterozygous/dispermic patterns (n=5) at multiple informative loci. We conclude that CHMCF confers a high risk for post-molar GTD. DNA genotyping contributes significantly to the precision diagnosis of CHMCF.
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