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[Female Preterm Monozygotic Twins Discordant for Fetal Megacystis due to Cloacal Dysgenesis After Conception by Intracytoplasmatic Sperm Injection - Case Report and Review of Literature].
Zeitschrift Für Geburtshilfe und Neonatologie 2016 October
Monozygotic twins were previously regarded as "identical". By now an increasing number of case reports of monozygotic but discordant twins have been reported, and therefore discordance between monozygotic twins is being investigated intensively. We report a case of female preterm monozygotic twins who were discordant for fetal megacystis due to cloacal dysgenesis. Pregnancy was achieved after intracytoplasmatic sperm injection and transfer of 2 embryos. By the first trimester fetal megacystis with consecutive oligohydramnios and hypoplasia of the lungs was diagnosed. Both foetuses had normal karyotypes. After delivery at 25+3 weeks of gestation due to premature labour, the affected child was treated palliatively and died within 2 hours. In the postmortem physical examination, a cloacal dysgenesis was detected. In the male foetus, megacystis is typically caused by obstructive uropathy. In the rarely affected female foetus, it usually results from complex urogenital malformations like cloacal dysgenesis which originates from disruption during gastrulation. We identified 10 case series of mono- or dizygotic twins who were discordant either for fetal megacystis or for cloacal dysgenesis. Issues like conception, zygosity, sex, karyotype and aetiology of fetal megacystis were not reported in all cases. Discordance between monozygotic twins for structural birth defects is closely linked to the twinning process itself. Assisted reproduction is said to generate a higher rate of monozygotic twin pregnancies and to be responsible for a higher prevalence of chromosomal aberrations or congenital malformations. With regard to conception, zygosity, sex, karyotype and combination of malformations, our case is unique.
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