Abstract:Heterokaryotypic monozygotic twins are rare. We report a set of monochorionic diamniotic twins complicated with lethal malformations and hydrops in one fetus at menstrual age of 16 weeks’. Sonographic appearances and genetic am-niocentesis result suggested for 45,X and 46,XY heterokaryotypic twins. Coexisting polyhydramnios found in the sac of severely malformed 45,X fetus threatened miscarriage and premature delivery. To salvage the phenotypically normal male fetus, the hydropic 45,X co-twin was selectively t… Show more
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